Search engines work by crawling hundreds of billions of pages using their own web crawlers. These web crawlers are commonly referred to as search engine bots or spiders.

Google Search is a fully-automated search engine that uses software known as web crawlers that explore the web regularly to find pages to add to our index.

Search engine indexing refers to the process where a search engine (such as Google) organizes and stores online content in a central database (its index). The search engine can then analyze and understand the content, and serve it to readers in ranked lists on its Search Engine Results Pages (SERPs).

To give you the most useful information, Search algorithms look at many factors and signals, including the words of your query, relevance and usability of pages, expertise of sources, and your location and settings. The weight applied to each factor varies depending on the nature of your query.