GEO Fundamentals · Reference 02

What Are the Abbreviations Used in AI Search Marketing?

A plain-language glossary of AI search marketing abbreviations, how the terms overlap, and what businesses should ask before comparing providers.

By Eric Wing, Founder of Darby · Published October 9, 2026 · Last reviewed October 9, 2026 · Approximately 12-minute read

The short answer

The main abbreviations used to describe AI search marketing are GEO (Generative Engine Optimization), AEO (Answer Engine Optimization), LLMO (Large Language Model Optimization), AISO (AI Search Optimization), and AI SEO (SEO for AI search). They generally describe work intended to help a business and its information appear in AI-generated answers.^{2, 3}

The naming gets messy quickly. One agency offers GEO. Another calls much of the same work AEO. A third sells AI visibility. Then there are terms that refer to a particular Google feature, along with names developed by individual providers.

There is no official dictionary for this field. Some terms have research behind them; others began as service names. A few abbreviations even have competing definitions.

For a business comparing proposals, that creates a practical problem: you need to understand what the provider will actually do before you can compare the offers.

The main AI search marketing abbreviations

Nine commonly used abbreviations in AI search marketing and their documented meanings.
Abbreviation	Full meaning	How it is generally used
GEO	Generative Engine Optimization	Improving how a business or its content appears in answers produced by generative AI systems.^{1, 2}
AEO	Answer Engine Optimization	Making information useful for direct answers, including AI responses, featured snippets, and voice search.^{2, 4}
LLMO	Large Language Model Optimization	Improving how information about a brand is represented in language-model-based systems.²
LLM SEO	Large Language Model Search Engine Optimization	Another name for work intended to earn discovery, mentions, and citations in language-model-based search.⁵
AI SEO / AISEO	AI-focused Search Engine Optimization	Can mean optimizing for AI search or using AI tools to carry out SEO work.^{4, 6}
AISO	Artificial Intelligence Search Optimization	A broad term for improving visibility across AI search experiences.³
AIO	Artificial Intelligence Optimization	A broad optimization term. Also used as shorthand for Google’s AI Overviews.^{8, 16}
GSO	Generative Search Optimization	Often used as an alternative name for GEO.³
GAIO	Generative AI Optimization	Usually refers to optimization for generative AI. Some providers use it to mean Google AI Overview Optimization.^{3, 7}

These definitions reflect documented usage, but agencies and software companies draw the boundaries differently. A proposal should explain which meaning it uses, especially for AI SEO, AIO, and GAIO.^{2, 3, 4, 5, 6, 7, 8, 16}

Where GEO, AEO, and LLMO differ

AEO has a history beyond today’s generative AI tools. A featured snippet answering a question in Google, a spoken response from a voice assistant, and an answer generated by an AI system can all fit within its scope. The emphasis is on providing an answer someone can use directly.⁴

GEO focuses specifically on generative responses. The term was formalized in the research paper GEO: Generative Engine Optimization, first released in 2023 and later accepted at KDD 2024. The researchers examined how content creators could improve the visibility of their material within answers assembled by generative engines.¹

LLMO takes its name from the technology producing the response: the large language model. In marketing, the term usually concerns how information about a business appears in language-model outputs.²

The work overlaps.

Take a Boston moving company that wants to appear when a buyer asks, “Which movers handle office relocations?” Useful work might include clarifying its commercial moving services, publishing a detailed relocation case study, and correcting inconsistent business information elsewhere online.

That work could appear in a proposal labeled GEO, AEO, or LLMO. The service name tells you less than the proposed changes, the reasoning behind them, and the questions the company intends to test.

Less common AI search abbreviations

Some additional labels identify a particular platform. Others reflect a provider’s terminology or its preferred way of describing the work.

Eight provider-specific, platform-specific, or less common AI search abbreviations.
Abbreviation	Full meaning	Where it appears
SAIO	Search Artificial Intelligence Optimization	Used by Digital Brand Expressions, which also shortens it to Search AI Optimization.⁸
AIEO	AI Assistive Engine Optimization	Kalicube terminology emphasizing how AI understands a business’s identity and authority.⁴
AsEO	Assistive Engine Optimization	Another assistive-engine term discussed by Kalicube.⁴
AIVO	AI Visibility Optimization	Emphasizes a brand’s presence and representation across AI-generated responses.⁹
AIRO	Artificial Intelligence Response Optimization	Used by providers such as Adogy to describe work on visibility in AI responses.¹⁰
GAIMO	Google AI Mode Optimization	Work focused specifically on Google’s AI Mode.²
AIOO	AI Overview Optimization	An uncommon abbreviation for work targeting Google AI Overviews.¹¹
SGEO	Search Generative Experience Optimization	An older label associated with Google’s Search Generative Experience terminology.¹²

A provider may have a useful method behind one of these names. Ask to see it. A different abbreviation, on its own, gives you little basis for judging the quality of the work.

The newer terms for AI agents

AI agents have brought another set of abbreviations into the conversation. These terms concern systems that can research options, compare suppliers, interact with websites, or take actions for a user.

Three emerging abbreviations focused on discovery and interaction by AI agents.
Abbreviation	Full meaning	General focus
ASO	Agentic Search Optimization	Helping AI agents discover and evaluate a business when researching options.¹³
AAO	AI Assistive Agent Optimization	Kalicube terminology addressing how assistive agents select and act on information about organizations.²
AAIO	Agentic Artificial Intelligence Optimization	A research term covering effective interaction between websites and autonomous AI agents.¹⁴

An agent might need to do more than mention your company. It could need to understand what you offer, compare your service with another option, or navigate a booking process. That extends the discussion beyond visibility into whether the website supports the task the agent is trying to complete.

Two abbreviations worth checking carefully

AIO and AI SEO cause particular confusion because each can describe two different things.

When someone says “AIO,” they may mean Artificial Intelligence Optimization. They may also mean Google’s AI Overviews, the search feature itself. An AIO visibility report could therefore be a report about Google, while an AIO service could cover several AI platforms.^{8, 16}

AI SEO has a similar ambiguity. A company offering AI SEO might be working to improve your presence in AI search. Another might be using AI software to research keywords, draft content, or automate parts of its SEO process. Those descriptions tell you different things about the engagement.^{4, 6}

Have the provider spell out the scope before you compare pricing.

How AI search optimization relates to SEO

The technical basics still matter. A useful service page needs to be accessible. Important information needs to be available as text. Visitors need to be able to find their way through the site.

Google continues to identify SEO best practices as foundational to success in its generative AI search features. Its documentation covers familiar requirements, including crawling, indexing, internal links, and structured data that matches the visible page content.^{15, 17}

AI visibility introduces additional questions for marketers to investigate. Does the business appear in the response? Is its service described accurately? Which sources support the answer? Does the system mention the company, cite its website, or recommend it as an option?

Those are different observations. A citation to an informational article does not automatically mean the business was recommended. A recommendation does not establish that someone became a customer.

What to ask before buying an AI search marketing program

The proposal should be understandable even if you remove the acronyms.

Ask the provider:

Which platforms and customer questions will you examine?
What have you found that explains our current visibility?
Which pages, listings, or other sources need attention?
What will you change, and why does that work come first?
How will you evaluate progress and connect it to qualified inquiries or sales?

“Improve GEO” leaves a lot unanswered. “Improve how our office relocation services are represented when Boston businesses compare moving companies” gives the engagement a clear audience, service, and decision to investigate.

It also gives you a way to challenge the recommendations. If the problem is an unclear service page, explain the service better. If the claim needs supporting evidence, develop that evidence. If information conflicts across sources, address the conflict.

Publishing more articles is one possible action. It needs a reason.

The terminology Darby uses

At Darby, we use Generative Engine Optimization, or GEO, for work concerning how businesses are discovered and represented in AI-generated answers. We also use “AI search visibility” when a plain-language description is more useful.

Our definition of GEO focuses on improving the digital evidence AI systems can find and use: the website, its technical accessibility, the information it contains, and credible supporting material elsewhere online.

We examine that evidence alongside the business’s goals. Better visibility can help, but the organization still needs to know whether it is reaching suitable buyers and generating worthwhile inquiries.

The abbreviation helps name the work. A clear diagnosis and a defensible plan make it worth doing.

Explore Darby’s approach to GEO and AI visibility →

Sources

Research papers establish their proposed terms. Provider pages document how those providers use their own labels; they do not make a label an official industry standard.

What Darby Looks At