Search engines perform several activities in order to deliver search results. Crawling – Process of fetching all the web pages linked to a website. This task is performed by a software, called a crawler or a spider (or Googlebot, in case of Google). Indexing – Process of creating index for all the fetched web pages and keeping them into a giant database from where it can later be retrieved. Essentially, the process of indexing is identifying the words and expressions that best describe the page and assigning the page to particular keywords. Processing – When a search request comes, the search engine processes it, i.e. it compares the search string in the search request with the indexed pages in the database.
Topics
