What is a search engine and how does it work?

Internet Basics
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A search engine is a service that helps users find information on the internet.

When you enter a search query, the search engine searches its index of webpages and returns results that it believes are relevant to your search. Popular search engines include Google, Bing, DuckDuckGo, and others.

Search engines use automated programs called crawlers or spiders to discover webpages across the internet. The information they find is organized into large indexes that can be searched in a matter of seconds.

Although search engines make finding information seem simple, a significant amount of technology works behind the scenes to discover, organize, and rank content.

If you’d like to learn more about search engines and how they work, check out the related resources below.

Key Takeaways

  • Search engines help users find information online.
  • Search engines discover websites using automated crawlers.
  • Search engines organize webpages into searchable indexes.
  • Search results are ranked based on many factors.
  • Search engines play a major role in how users navigate the web.

Related Resources

Related Community Discussions

Discussion Questions

  • Which search engine do you use most often?
  • Have you ever tried an alternative to Google?
  • What factors are most important to you when choosing a search engine?
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Many people assume that search engines search the internet in real time whenever a query is entered.

In reality, search engines typically search their own indexes of previously discovered webpages. Those indexes are constantly updated as crawlers discover new content and revisit existing websites.

This is one reason newly published webpages may not appear in search results immediately.

Did you know that search engines maintain massive indexes of webpages rather than searching the live internet every time you perform a search?

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One thing I’ve learned from working with websites is that many people don’t realize how much work search engines perform behind the scenes.

Crawling, indexing, ranking, and delivering results all happen incredibly quickly. It’s easy to take that process for granted until you stop and think about how much information search engines help organize every day.