Digital marketing is the broad umbrella that covers every online channel a business uses to reach customers, and SEO is one specific discipline within it. When people search “digital marketing in SEO,” they’re usually trying to understand how these two concepts overlap, where one ends and the other begins, and why they work best together. The short answer: SEO is a tool in the digital marketer’s toolbox, focused specifically on earning visibility in search engine results without paying for ads.
How SEO Fits Inside Digital Marketing
Digital marketing includes every tactic a business uses to promote itself online. That covers paid search ads, social media campaigns, email marketing, content marketing, affiliate programs, video marketing, and more. SEO (search engine optimization) is the slice of digital marketing dedicated to improving your website’s rankings in organic search results, meaning the unpaid listings that appear when someone types a query into Google or another search engine.
Think of digital marketing as the entire kitchen and SEO as one essential appliance. You can run a digital marketing strategy without heavy SEO investment, relying instead on paid ads or social media. But organic search remains one of the largest and most consistent sources of website traffic, which is why SEO tends to anchor most digital marketing plans. An SEO specialist focuses on increasing visits to a website through search engines, while a digital marketing manager oversees the full mix of channels to grow a company’s overall online presence.
What SEO Actually Involves
SEO breaks down into a few core areas, each contributing to how search engines evaluate and rank your pages.
- Keyword research: Identifying the specific words and phrases your target audience types into search engines, then building content around those terms.
- On-page optimization: Structuring your pages so search engines can understand them. This includes writing clear title tags, using descriptive headings (H2, H3), adding relevant internal links, and making sure your content directly answers the searcher’s question.
- Technical SEO: Making sure your site loads quickly, works well on mobile devices, is easy for search engine crawlers to navigate, and uses structured data that helps search engines interpret your content.
- Content creation: Publishing useful, original material that serves the reader. Search engines prioritize valuable, relevant content, so thin or generic pages tend to rank poorly.
- Link building: Earning links from other reputable websites back to yours, which signals to search engines that your content is trustworthy and worth recommending.
Search engines constantly update the way they rank sites, so SEO requires ongoing attention rather than a one-time setup. An SEO specialist’s job is to keep up with those changes and adjust the website’s content and technical foundation accordingly.
How SEO Supports Other Digital Channels
SEO doesn’t operate in isolation. The keyword data you gather from SEO research can directly improve your paid search campaigns by showing which terms drive the most relevant traffic. If you discover that a particular long-tail keyword converts well organically, you can bid on it in a pay-per-click (PPC) campaign to capture even more of that audience. The reverse also works: PPC data revealing high-converting search terms can guide your organic content strategy.
Content you create for SEO, like blog posts, guides, and how-to articles, doubles as material for email newsletters and social media sharing. Social engagement on those posts can generate brand mentions and backlinks, which in turn strengthen your search rankings. This feedback loop is why experienced marketers treat SEO, content, social, and paid search as interconnected rather than separate silos. Consistency across your digital channels builds trust, and a balanced approach that combines organic and paid visibility tends to outperform either one alone.
Measuring SEO’s Contribution
Because SEO sits within a larger digital marketing strategy, you need to measure its performance in terms that connect to business goals, not just rankings. The traditional metrics still matter: organic traffic volume, keyword positions, click-through rates from search results, and conversion rates from organic visitors.
But the measurement landscape is expanding. Beyond simple rankings, marketers now track how often a brand gets cited across the broader digital ecosystem. That includes traditional backlinks, unlinked brand mentions on news sites and forums, appearances in knowledge graphs (the structured information boxes Google displays), and increasingly, references in AI-generated responses from tools like ChatGPT, Perplexity, and Google’s AI Overviews. Tracking citation volume, the diversity of platforms mentioning you, and your share of voice in AI-generated answers gives a fuller picture of how your SEO efforts are building authority.
Google’s quality guidelines emphasize what it calls E-E-A-T: Experience, Expertise, Authoritativeness, and Trustworthiness. These aren’t direct ranking factors you can toggle on, but they describe the qualities Google’s systems look for when deciding which content deserves top placement. Content from recognized experts, backed by real experience, published on trustworthy sites, tends to rank better and get cited more often.
How AI Search Is Changing the Relationship
AI-generated summaries in search results are reshaping how SEO fits into digital marketing. Google’s AI Overviews now answer many queries directly on the results page, which means some searchers never click through to a website. Research from Semrush and Moz suggests AI Overviews could reduce organic click-through rates by anywhere from 18% to 64%, especially for straightforward informational queries.
This shift doesn’t make SEO irrelevant. It changes what kind of content earns traffic. Pages that simply answer a basic question in a few sentences are the most vulnerable, because AI can summarize that information on its own. Content that offers depth, original research, proprietary data, expert analysis, or real-world application is harder for AI to replicate or condense, and it tends to be what AI systems cite as a source.
For digital marketers, this means SEO strategy is evolving in a few practical ways. Long-tail and niche keywords, the specific and nuanced queries that AI overviews struggle to answer well, become more valuable. Video and visual content are gaining priority as AI Overviews embed multimedia directly in results. And structuring content with clear headings, bullet points, and direct answers to specific questions helps AI systems identify and cite your material, which can drive visibility even when the traditional blue-link click declines.
SEO Specialist vs. Digital Marketing Manager
If you’re considering a career or trying to hire, it helps to understand where these roles diverge. An SEO specialist focuses narrowly on organic search: auditing websites, researching keywords, optimizing page content, building links, and monitoring rankings. Their goal is to increase the quantity and quality of traffic arriving through search engines.
A digital marketing manager works at a higher level, coordinating across SEO, paid ads, email, social media, and sometimes offline digital channels like SMS or connected TV. They may work alongside an SEO specialist on a campaign, using SEO insights to inform the broader strategy. The digital marketing manager cares about the company’s total online visibility, while the SEO specialist owns one critical piece of that puzzle.
In smaller organizations, one person often handles both roles. In larger companies, SEO is a dedicated function with its own team, feeding data and insights into the broader marketing department. Either way, the most effective digital marketing strategies treat SEO not as a separate project but as a foundational layer that strengthens every other channel it touches.