What Is a Web Crawler and How Does It Work

A web crawler, also known as a web spider or search engine bot, is a bot that visits and indexes the content of web pages all over the Internet. With such an enormous amount of information, a search engine will be able to present its users' relevant information in the search results.

The goal of a web crawler is to get information, often keep getting fresh information to fuel a search engine.

If a search engine is a supermarket, what a web crawler does is like grand sourcing — it visits different websites/web pages, browses, and has the information stored in its own warehouse. When a customer comes over and asks for something, there will be certain goods to offer on the shelves.

It sources by indexing web pages and the content they contain. The indexed content will be ready for retrieval and when a user searches for a particular query, it will be able to present the user with the most relevant information.

A web crawler is a super workaholic or it must be one. This is not only because there is an enormous number of new pages being created every minute in the world (around 252,000 new websites are created every day worldwide according to Siteefy), but also due to the changes and updates of these pages.

There are some web crawlers active on the Internet:

They are mainly for search engines. Despite web crawling bots that work for a search engine, some web crawlers gather websites information for SEO purposes, such as site audit and...

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