Search engines work by crawling the internet to build an index of documents (‘crawling’ is the term used to describe how search engine bots move around websites).

Before a search engine can tell you where a file or document is, it must be found. To find information on the hundreds of millions of Web pages that exist, a search engine employs special software robots, called spiders, to build lists of the words found on Web sites.

A search engine navigates the web by downloading web pages and following links on these pages to discover new pages that have been made available. They crawl hundreds of billions of pages using their own web crawlers. These web crawlers are commonly referred to as search engine bots or spiders.

The algorithm is what the search engines use to determine the relevance of the information in the index to what the user is searching for. One of the elements that a search engine algorithm scans for is the frequency and location of keywords on a Web page.

For most of us when we think “search engine” we think Google. After all, Google gets over 63,000 searches per SECOND. And for most people, “the internet” is what comes up when you search in Google.

In short, a search engine is a system run by programs which “crawl” the web for information including web pages, images, files, videos and other detectable documents. When a new document is detected (or the crawler detects an update on that document), its data is stored on the search engine server in a process referred to as caching.

Search algorithms work as a large collection of other algorithms and formulas, each with its own purpose and task, to produce results a user will be satisfied with.

Search engines are complex computer programs. To fully understand every aspect of a search engine, you’d have to do a lot of studying and gain a deep understanding of computer algorithms. However, although most search engines will provide tips on how to improve your page ranking, the exact algorithms used are well guarded and change frequently to avoid misuse.

Most search engines show ads next to their search results. If a user clicks on one of these ads, the search engine is being paid for having directed the user to the advertiser's site.

Web search engine submission is a process in which a webmaster submits a website directly to a search engine. While search engine submission is sometimes presented as a way to promote a website, it generally is not necessary because the major search engines use web crawlers that will eventually find most web sites on the Internet without assistance.

Ask a freelance SEO consultant and they will tell you that search engines are answer machines. They persist to get knowledge, grasp the idea of something, and systematize the content of the Internet. Before your website can rank highly in the search engines, it is important to understand how search engines work. In order for search engines to tell you where to find information, it must find the information first.

If you want searchers to see your content on your website, the first thing you must make sure is accessibility. You’ll let the crawlers of the search engine access your content and allow them to index it.

At present, search engines are trying to develop for natural language queries. Being able to understand what we speak, in a free manner, will truly revolutionize this technology.