HeyLang

Large Language Model (LLM)

The AI trained on vast text that powers ChatGPT, Claude, and Gemini — and, increasingly, marketing itself.

A large language model (LLM) is a type of artificial intelligence trained on enormous amounts of text to understand and generate human-like language. LLMs are the engines behind ChatGPT, Claude, and Gemini.

You don't need to know how they work to see why they matter to your business: LLMs now write content, answer customer questions, and — through AI answer engines — decide whether your business gets recommended at all.

Two ways they touch your marketing

  • As a tool — drafting content, replying to reviews, planning campaigns. Quality depends on how they're directed.
  • As a gatekeeper — when a customer asks an AI for a recommendation, being the answer is the goal of GEO.

An AI marketing department is what happens when you point a coordinated set of LLM-powered agents at every part of your marketing at once.

Related:GEO (Generative Engine Optimization)Prompt EngineeringAI Marketing Department

Want to never think about this again?

HeyLang handles large language model (llm) — and the rest of your marketing — without ever bringing it up. This very definition was written by it.

Try HeyLang free

Keep exploring

The blogField notes from the ghostTactics, teardowns, and what's actually working — written by the thing doing the work.ExploreCompareHeyLang vs. the alternativesSee how finished work stacks up against single-tool AI and agencies.ExploreValue calculatorWhat you'd save with HeyLangAdd up what a marketing team, freelancers, and tools really cost — then see the gap.Explore

Other glossary terms

Every marketing term a business owner runs into — search, filter, and browse.

AI Marketing Department
A coordinated team of AI agents that runs your marketing end to end — strategy, content, local, social, reporting.
Attribution
Figuring out which marketing touch actually earned the sale — so you know what to keep funding.
Backlink
A link from another website to yours — one of Google's strongest votes of trust.
Citation
Any online mention of your business's name, address, and phone — the currency of local trust.
Content Marketing
Earning customers by publishing genuinely useful content instead of renting attention with ads.
Conversion Rate
The percentage of visitors who do what you want — buy, book, or call. The number marketing lives or dies on.
Core Web Vitals
Google's three speed-and-stability scores for how a page feels to load. Slow pages rank worse.
Domain Authority
A 0–100 score estimating how likely a whole website is to rank. Higher is harder to beat.
Editorial Calendar
The schedule of what content gets published, when, and by whom — the antidote to sporadic posting.
Engagement Rate
The share of people who liked, commented, or shared your post — the real health metric for social.
Featured Snippet
The boxed answer Google pulls to the very top of results — "position zero."
GEO (Generative Engine Optimization)
Getting your business cited inside AI answers — ChatGPT, Gemini, Perplexity — not just Google's blue links.
Google Business Profile
Your free Google listing — the map pin, hours, photos, and reviews that decide if locals find you.
Keyword Research
Finding the exact phrases your customers type into Google — and how hard each is to win.
Local Pack
The map plus three business listings Google shows at the top of local searches. The prime real estate.
Local Proximity
How close a searcher is to your business — a ranking factor you can't control but can work around.
Long-Tail Keyword
A longer, more specific search phrase — lower volume, but far easier to rank and readier to buy.
Meta Description
The gray summary line under your Google result. It doesn't rank you — it earns the click.
NAP (Name, Address, Phone)
Your business name, address, and phone — kept identical everywhere online so Google trusts your location.
Pillar Page
A big, authoritative page on a core topic that links out to — and is supported by — related articles.
Programmatic SEO
Generating hundreds of targeted pages from a template and data to capture long-tail demand at scale.
Prompt Engineering
The craft of instructing an AI precisely enough to get useful, on-brand output instead of generic filler.
ROAS (Return on Ad Spend)
Revenue earned for every dollar spent on ads. The scoreboard for whether paid marketing is working.
Search Intent
The real reason behind a search — to learn, to compare, or to buy. Match it or you won't rank.
SEO (Search Engine Optimization)
The practice of getting your business found on Google without paying for each click.
Social Proof
Evidence that other people trust you — reviews, followers, testimonials — that makes new buyers say yes.
Technical SEO
The plumbing — speed, crawlability, mobile, structured data — that lets Google read and trust your site.
Title Tag
The clickable headline of your page in Google results — and one of the strongest on-page ranking signals.
Filter