SEO vs. GEO vs. AIO vs. SXO: A Plain-English Glossary

Every few months a new two- or three-letter acronym lands in the marketing vocabulary, and teams start using them interchangeably until nobody can say what they’re actually optimizing for. The result is a strategy that tries to do everything and lands nowhere. A shared glossary fixes that — because these disciplines really are different jobs, even though they draw on the same foundations. For more on query control, see our approach to negative keywords.

Here’s the plain-English version, and where each one begins and ends.

The four disciplines, defined

SEO is the original: earn crawlability, authority, and relevance so you rank in the classic list of links. GEO extends the goal into generative engines — being the source an LLM cites when it synthesises an answer. AIO is narrower and more recent, aimed at appearing inside the AI overviews and answer boxes that now sit atop search results. SXO shifts focus past acquisition entirely, optimizing the landing experience so the traffic you earn actually converts. To understand the underlying data infrastructure, review our guide on server-side tagging.

Where they overlap — and where they don’t

All four feed on the same raw materials: technical health, structured data, genuine authority, and clear content. Improve those and every discipline benefits. But the outcomes diverge sharply. You can rank #1 (SEO) and still never be cited by an LLM (GEO). You can be cited everywhere (GEO) and still convert nobody (SXO). Treating them as one metric hides exactly these failure modes.

How to sequence them

Don’t chase all four at once. Get the SEO foundation right, because everything else draws on it. Layer GEO and AIO on top by making your best answers quotable and structured. Then make SXO non-negotiable, because winning visibility only pays if the post-click experience converts. Sequenced this way, each discipline compounds the last instead of competing for the same budget.

So which one are you actually failing at?

Map your last quarter’s work to these four buckets. If it all landed in SEO while your competitors are getting cited in AI answers and converting their traffic, the acronym you’re missing is the one to fund next. Clarity about the categories is the first step to a strategy that isn’t quietly incoherent.