What is Search Engine?
A search engine is a software system designed to help users find information stored on the internet or within a specific database. It works by indexing vast amounts of web pages or other content and then providing relevant results in response to user queries.

The basic process of a search engine involves several steps:

1. Crawling: The search engine sends out automated programs called crawlers or spiders to explore the web and discover new content. These crawlers follow links from one page to another and index the content they find.

2. Indexing: Once the crawlers discover a page, its content is analyzed and stored in a massive database known as an index. The index contains information about the content of each page, including keywords, metadata, and links.

3. Ranking: When a user enters a search query, the search engine retrieves relevant results from its index and ranks them based on various factors such as relevance, quality, and authority. Algorithms determine the order in which results are displayed on the search engine results page (SERP).

4. Retrieval: Finally, the search engine presents the ranked results to the user in the form of a list, often with snippets of text from each page to give users an idea of what they contain. Users can then click on the results to visit the corresponding web pages.

Google, Bing, Yahoo, and Baidu are some of the most popular search engines used worldwide. They have become essential tools for navigating the vast amount of information available on the internet.