A search engine is a software system that helps users find information on the internet by entering keywords, questions, or phrases. Popular search engines include Google, Bing, Yahoo, and DuckDuckGo. When a user enters a query, the search engine searches through its huge database of web pages and displays the most relevant results. Search engines generally work through three major processes: crawling, indexing, and ranking. Crawlers or bots discover and scan web pages, indexing stores and organizes information from those pages, and ranking algorithms determine which pages should appear first for a particular search query.Search engines use complex algorithms and artificial intelligence to understand the meaning and intent behind a search rather than simply matching individual words. They consider hundreds of signals, such as the relevance and quality of content, keywords, website structure, page experience, links, freshness of information, location, and sometimes the user's search context. For example, if someone searches for “best digital marketing agency in India,” the search engine tries to understand that the user is looking for agencies that are relevant to digital marketing and located in India. The results are then ranked according to how useful and trustworthy the search engine believes each page is.