A search engine is a software programme that searches a database of websites, such as Google or Bing, to find information in response to a user's query. When you use a search engine, you enter a query, i.e. a word or phrase about which you want to find information. The search engine then searches its database of websites and returns a list of results that it thinks are relevant to your query.
Search engines use algorithms to determine the relevance of websites to a particular search query. Various factors are taken into account, such as the words used on the website, the links to and from the website, and the overall authority and credibility of the website. Based on these factors, the search engine ranks the websites in its database and displays the most relevant results at the top of the search results page.
Search engines are an important tool for finding information on the internet and are used by millions of people around the world every day.