The top 10 widely used search engines of this world are shared below:-
1- Google
2- Bing
3- Yahoo
4- Baidu
5- Ask
6- AOL
7- Altavista
8- Lycos
9- DuckDuckGo
10- Entireweb
Disclaimer:- The above lists just gives an idea about the most popular search engines of this world. The market shares of these search engines may change at any given time. For a more accurate prediction, see the graph below:-
Source: StatCounter Global Stats – Search Engine Market Share