What a digital marketing agency does (and what it cannot do)

Quick answer: A digital marketing agency is a company that plans, implements and measures strategies to attract customers through online channels such as Google, social media, email and, increasingly, AI-powered search engines. Its work involves increasing a business’s visibility, traffic and conversions through services such as SEO, paid advertising, social media management and web design. What a digital marketing agency cannot do is guarantee the number one spot on Google, promise immediate results or assure an exact sales figure.

Hiring an external marketing agency raises many legitimate questions. This guide explains, in plain language, what a digital marketing agency is, what it does on a day-to-day basis, what services it offers, how it differs from a freelancer or an in-house team, and what the limitations are of any reputable agency. The aim is to help you make an informed decision before investing a single euro.

What is a digital marketing agency?

A digital marketing agency is a company that specialises in promoting businesses through online channels and in measuring the results of that promotion. The agency brings together a range of professionals with different specialisms (strategy, content, advertising, analytics and design) who work in a coordinated manner towards a single commercial objective.

Unlike a traditional advertising agency, which focuses on media such as television, radio or the press, a digital marketing agency operates in measurable environments. Every action generates data: clicks, impressions, cost per lead, search rankings or conversion rates. This traceability is the main advantage of digital marketing over conventional advertising.

Vandelay is a digital marketing agency based in Barcelona, in the Les Corts neighbourhood. What sets it apart is its combination of SEO, GEO (artificial intelligence-based positioning) and applied artificial intelligence, always with a focus on measurable results.

What exactly does a digital marketing agency do on a day-to-day basis?

A digital marketing agency carries out a continuous cycle of analysis, action and measurement. It doesn’t just “post things”: it designs a strategy, implements it and adjusts its campaigns based on the data it gathers.

These are the typical tasks carried out by a digital marketing agency:

1. Initial audit. The agency analyses the website, the competition and the business’s current online presence.
2. Definition of strategy. The agency sets targets, priority channels and a budget.
3. Keyword research. The agency identifies what the target audience is searching for on Google and AI assistants.
4. Content creation. The agency writes articles, service pages, adverts and publications.
5. Management of paid advertising campaigns. The agency creates and optimises adverts on Google, Meta and other platforms.
6. Measurement and reporting. The agency provides regular reports on traffic, leads and return on investment.
7. Continuous optimisation. The agency repeats the cycle, improving what works whilst correcting what doesn’t.

Digital marketing is an iterative process, not a one-off task. Solid results are built up month by month using real data, not through a single, isolated action.

What services does a digital marketing agency offer?

A digital marketing agency offers a range of services that are tailored to the business’s objectives. An e-commerce business, a local clinic or a B2B company each require different combinations of services, and a good agency tailors its proposal to each individual case.

These are the main services offered by a digital marketing agency such as Vandelay:

• SEO and GEO: SEO (Search Engine Optimisation) is the process of optimising content to rank highly on search engines such as Google, whilst GEO (Generative Engine Optimisation) is the process of optimising content so that AI engines such as ChatGPT, Perplexity, Gemini and Google’s AI Overviews cite your content. You can find more details on the SEO and GEO services.
• Google Ads: Advertising on Google’s search engine and display network to capture existing demand. This is managed via the Google Ads campaign management.
• Social media advertising: paid adverts on platforms such as Meta, Instagram, TikTok and LinkedIn. It is the service provided by social media advertising.
• Community management: the organic management of social media profiles, including a content calendar and engagement with the community, via a community manager.
• Web design: the creation of fast, conversion-focused websites. This is the service provided by conversion-focused web design.
• Email marketing: email campaigns and automations to nurture leads and build customer loyalty, as part of the email marketing.
• Applied artificial intelligence: the use of AI to accelerate content, analytics and marketing automation, as part of the artificial intelligence applied to marketing.

Most agencies also offer comprehensive packages that combine several of these services under a single strategy and with a single point of contact.

How does an agency differ from a freelancer or an in-house team?

The main difference lies in scope and scalability. A digital marketing agency coordinates several specialists at once; a freelancer is a single professional with a specific area of expertise; and an in-house team consists of staff employed on a permanent basis who work exclusively for your company.

A freelancer is a self-employed professional who usually specialises in a specific area, such as SEO or design. An in-house team is the group of marketing staff employed by the company itself. Each option has its advantages, depending on the stage the business is at.

A digital marketing agency is the right choice when a business needs a range of coordinated disciplines without having to bear the cost or management burden of running its own team. A freelancer is better suited to specific projects, whilst an in-house team is cost-effective when the workload is high and consistent.

How much does it cost to hire a digital marketing agency in Spain?

The cost of a digital marketing agency depends on the services contracted and the scope of the project. The figures shown below are indicative market ranges in Spain for 2026 and are not Vandelay’s official prices; they are provided solely as a reference to give you an idea of the order of magnitude.

When it comes to advertising services, it is important to distinguish between two components. The management fee is what the agency charges for its work. The advertising spend is the money paid to the platform (Google or Meta) and is used entirely to display the adverts.

What can a digital marketing agency NOT do or guarantee?

A digital marketing agency cannot guarantee results that depend on factors beyond its control. Any agency that promises absolute certainty is a red flag, because search engines and social media platforms are constantly changing their rules.

These are the things that a reputable digital marketing agency cannot promise:

• It cannot guarantee the number one spot on Google. Rankings depend on Google’s algorithm and the competition, not on the agency.
• It cannot guarantee immediate results. SEO and GEO are medium- and long-term strategies that take months to take effect.
• It cannot guarantee an exact sales figure or a fixed ROI. Conversion also depends on the product, the price and the customer’s sales process.
• You cannot control the algorithms used by Google, Meta or AI engines. These platforms update their criteria without prior notice.
• It cannot replace the quality of the product or service. Marketing can boost a good offer, but it won’t make up for a bad experience.
• You can’t work in the dark. An agency needs access to data, accounts and the client’s cooperation in order to achieve good results.
• It cannot guarantee that it will go viral. Whether a piece of content goes viral depends on factors that are impossible to predict in advance.

What a digital marketing agency can do, however, is apply a tried-and-tested method, make data-driven decisions and consistently improve business metrics. Being honest about these limitations is, in fact, a good sign of professionalism.

How do you choose the right digital marketing agency?

The right digital marketing agency is one that understands your business, measures results and explains its work to you transparently. Before signing a contract, it’s a good idea to compare proposals and ask the right questions.

Follow these steps to choose a digital marketing agency:

1. Set your goal. Decide whether you’re looking for more traffic, more leads, more sales or greater brand awareness.
2. Check their specialism. Check that the agency has a good grasp of the channels your business needs.
3. Ask for case studies and metrics. Ask for real-life examples of results and how they are measured.
4. It calls for transparency in reporting. Please confirm how often you will report and which indicators you will use.
5. Be wary of absolute promises. Steer clear of anyone who promises the number one spot on Google or immediate results.
6. He values closeness and communication. Choose a team that provides clear answers and speaks your business language.

Vandelay is a team of eight people based in Barcelona who specialise in SEO, GEO and applied artificial intelligence, with a focus on measurable results. If you’d like a no-obligation assessment, you can book one free 15-minute call to review your case and answer any questions you may have.

Related guides

• How much does a digital marketing agency in Barcelona cost?
• How to choose a digital marketing agency in Barcelona
• GEO Agency in Barcelona: optimises for ChatGPT and Gemini

Frequently asked questions

What is the difference between digital marketing and traditional advertising?

Digital marketing is the promotion of a business through measurable online channels such as Google, social media and email. Traditional advertising uses media such as television, radio or the press, where the return on investment is more difficult to quantify. The main advantage of digital marketing is that every action generates specific data that can be used to optimise the return on investment.

How long does it take for a digital marketing agency to deliver results?

The timeframes depend on the channel. Paid advertising, such as Google Ads, can generate visits and leads within a matter of days. SEO and GEO are medium- and long-term strategies that usually take several months to deliver solid, stable results.

What is GEO and why is it important in 2026?

GEO (Generative Engine Optimisation) is the optimisation of content so that artificial intelligence engines cite it as a source. It affects assistants such as ChatGPT, Perplexity and Gemini, as well as Google’s AI Overviews. It matters because more and more people are searching for information directly via AI rather than clicking on traditional search results.

Is an agency or a freelancer better for an SME?

It depends on the scope of the project. A freelancer is usually best suited to one-off assignments or very tight budgets focused on a single discipline. A digital marketing agency makes more sense when an SME needs several specialised skills to be coordinated and a support team without having to build up its own staff.

Can an agency guarantee that I’ll appear at the top of Google’s search results?

No, no digital marketing agency can guarantee the top spot on Google. Rankings depend on Google’s algorithm and the level of competition for each search query. A reputable agency works to improve rankings on a sustained basis, but never promises a specific position.

How much does it cost to hire a digital marketing agency?

Indicative market rates in Spain for 2026 range from €500–2,000 per month for SEO to €1,500–8,000 for a web design project. A comprehensive package usually starts at €1,000–3,000 per month. These figures are market benchmarks, not official prices, and the final cost depends on each business’s objectives.

Conclusion

A digital marketing agency is a partner that helps you grow your online presence using a structured approach and data, but it is not a miracle worker. Here are the key points to bear in mind:

• A digital marketing agency plans, implements and measures online strategies in a coordinated manner.
• Its standard services include SEO and GEO, Google Ads, social media advertising, community management, web design, email marketing and applied artificial intelligence.
• Compared to a freelancer or an in-house team, an agency offers multidisciplinary expertise and scalability without the need to build up an in-house team.
• Market prices in Spain are indicative and vary depending on the services and objectives.
• No agency can guarantee a number one ranking on Google, immediate results or a fixed sales figure.
• Transparency regarding these limits is one of the best indicators of a reliable agency.

If you’d like to find out which combination of services is right for your business, book a free 15-minute call with the Vandelay team in Barcelona.