A search engine is a program or tool that allows users to search for information on the internet. The basic concept of a search engine is simple: it indexes websites and web pages, and then allows users to search this index using keywords or phrases. When a user enters a query, the search engine scans its index for relevant results and returns them in order of relevance.
Search engines use complex algorithms and ranking systems to determine which results to display and in what order. These algorithms take into account various factors such as keyword frequency and density, website quality and authority, and user behavior.
The most popular search engine in the world is Google, which has a market share of over 90% in many countries. Other well-known search engines include Bing, Yahoo!, Baidu (in China), Yandex (in Russia), and DuckDuckGo.
Search engines have become an essential tool for navigating the vast amount of information available on the internet. They allow users to quickly find the information they need and help to make the internet more accessible and usable for everyone.
Here is a list of search engines:
4. Baidu (in China)
5. Yandex (in Russia)
8. AOL Search
9. Wolfram Alpha
Note that there are many other search engines available, and new ones may emerge over time as technology and user needs change.