A web crawler is a software category. It is a subclass of Internet bot, and its documented uses are web scraping and web indexing. Everything else people say about crawlers — including most of what is currently said about AI crawlers — is built on top of that definition rather than contained in it, and it is worth separating the two.
What the definition actually contains
Three facts, and they are load-bearing.
A web crawler is a software category, not a single program. It names a class of things, which is why “the crawler” is usually the wrong noun.
It is a subclass of Internet bot. Its parent category is automated clients on a network, so anything true of Internet bots generally is true of it, and nothing about intelligence, intent or comprehension is implied by the classification.
Its uses are web scraping and web indexing. Web indexing is itself a technology and a subclass of both algorithm and indexing. So the crawler-to-index relationship is part of the definition: a crawler is a thing whose purpose includes feeding an index.
What a software agent is, separately
A software agent is a type of tool. It is a subclass of computer program, of tool, and of artificially intelligent entity, and it is said to be the same as a software bot.
Set those classifications beside the crawler’s and the difference is visible without inventing anything. A web crawler’s parent class is Internet bot. A software agent’s parent classes include artificially intelligent entity. Both are automated software; they are not classified under the same thing, and one of the two classifications mentions intelligence while the other does not.
That is a comparison of two definitions. It is not a claim that agents replace crawlers, that they behave differently on your server, or that one evolved from the other. Those may all be true. None of them is in the record, so this post does not assert them.
What a large language model is, separately again
A large language model is an artificial intelligence model type and a subclass of language model. It uses AI prompts and the transformer architecture. Its parts include the generative pre-trained transformer and generative artificial intelligence, its documented uses include conversational AI and computer security, and its opposite is the small language model.
Note what is absent: nothing in that definition connects a large language model to a web crawler. The phrase “AI crawler” joins two categories that the record does not join. It may name something real — but the joining is an assertion somebody is making, not a definition anybody can look up, and treating it as the latter is how a plausible sentence becomes a repeated fact.
Why this post is shorter than it wants to be
This is the honest part, and it is the reason the post exists in this form.
The obvious version of this article explains how AI crawlers differ from search crawlers, what that means for your server, and what you should change. Writing it requires relating a web crawler to a large language model, and no verified fact does that. Every sentence would have been an invention wearing the costume of a definition.
Search engine optimization illustrates the same restraint. It is a field of study and a professional skill, practiced by SEO specialists, sitting under internet marketing, digital marketing, marketing strategy and search engine marketing, and its parts include backlinks and on-page SEO. It is also recorded as different from generative engine optimization. All of that is about SEO. None of it says what a crawler does with a backlink, so this post does not either.
The summary
A web crawler is a software category and a kind of Internet bot, used for web scraping and web indexing. A software agent is a tool and an artificially intelligent entity. A large language model is an AI model type that uses prompts and transformers. Those are three definitions, and the interesting claims live in the space between them — which is exactly the space where nothing has been verified yet.
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