Last week at SEO Week in New York City, a new acronym landed on the slides: HEO — Hybrid Engine Optimization. Within hours, the screenshots were circulating on Reddit with comments like "First SEO, then AEO, GEO, LLMO now HEO. Many more to come."
The reaction is fair. In three years, the search marketing world has produced five acronyms for what is, mostly, the same job: getting your business found. So before you spend money on a "GEO consultant" or panic about HEO, here is what each term actually means — and which ones are worth your attention.
The five acronyms, defined
SEO — Search Engine Optimization
The original. Born in the late 1990s. The goal is straightforward: rank your pages high on Google (and to a lesser extent Bing) for queries your customers type into a search box. The tactics are well-documented — keyword research, technical site health, backlinks, content quality, page speed.
SEO is not dead. Google still drives the majority of organic discovery for most businesses. But it is no longer the only game.
AEO — Answer Engine Optimization
Coined around 2017, when voice assistants (Alexa, Siri, Google Assistant) and featured snippets started serving direct answers instead of a list of links. AEO is about being the answer, not one of ten blue links. Tactics: structured data, FAQ schema, concise definitions, clear question-and-answer formatting.
GEO — Generative Engine Optimization
The first acronym specifically for the AI era. Coined around 2023–2024. The goal: get your brand cited inside the answers generated by ChatGPT, Perplexity, Gemini, Claude, and similar tools. The tactics are different from classic SEO. Backlinks matter less. Citation in trusted sources, structured content, clear authoritative information, and presence in datasets the models trained on matter more.
LLMO — Large Language Model Optimization
Functionally identical to GEO. Different writers prefer different labels. If you read an article that distinguishes them, the distinction is usually marketing, not substance. Treat them as synonyms.
HEO — Hybrid Engine Optimization
The newest entry, introduced at SEO Week NYC, April 2026. The core idea: stop treating Google rankings and AI visibility as two separate marketing channels. Measure them as one system. If you optimize aggressively for AI citations and your Google traffic collapses, you have made yourself worse off. If you optimize only for Google and never appear in ChatGPT answers, you are missing where buyers increasingly start their research.
HEO is the only acronym in this list that adds a genuinely new idea — and it is also the most defensible one.
So which ones actually matter?
Honestly, three of these are the same thing wearing different hats. AEO, GEO, and LLMO all answer the question "how do I show up where AI is giving direct answers instead of search results?" The tactics overlap by roughly 80 percent. If a vendor tries to sell you all three as separate services, that is a sales tactic, not a strategy.
What matters is this:
- Classic search visibility — can people find you on Google? (SEO)
- AI visibility — when someone asks ChatGPT, Perplexity, or Claude about your category, does your brand come up? (GEO / LLMO / AEO)
- The relationship between the two — are you trading one for the other, or growing both? (HEO)
That is the whole framework. Five acronyms, three actual things to measure.
What the acronyms keep getting right
Each new label highlights a real shift, even when the underlying playbook barely changes. AEO pointed out that voice and snippets had broken the "ten blue links" assumption. GEO pointed out that LLMs were a new discovery surface. HEO is pointing out that businesses cannot afford to manage these channels in isolation.
So the labels are not useless. They are signposts. The mistake is treating each new signpost as a brand new road requiring a brand new vehicle.
What you should actually do in 2026
Whatever the next acronym is — and there will be a next one — the fundamentals do not change:
- Be a credible, citable source — depth, accuracy, and authority on a clear topic
- Make your content machine-readable — clean HTML, schema markup, llms.txt, accessible to AI crawlers
- Measure where you appear — across both Google and the major AI platforms
- Fix the gaps — when you are invisible to ChatGPT but your competitor is mentioned, that is a fixable problem
That is not five disciplines. It is one discipline with multiple measurement surfaces.
How VisibAI fits
VisibAI was built for the third item on that list. We run an audit across ChatGPT, Claude, Perplexity, Gemini, Mistral and You.com, score your brand visibility across all of them, identify which competitors are showing up instead of you, and produce a fix list and downloadable schema and robots.txt files.
We do not particularly care which acronym is in fashion. The job is the same: when someone asks an AI about your category, your brand should be in the answer.
TL;DR: SEO is for Google. AEO, GEO, and LLMO are mostly the same thing — getting cited by AI answers. HEO is the new one, and the only genuinely useful addition: measure search and AI visibility together, not separately. The labels will keep changing. The work mostly will not.