There are roughly seven search engines that are used today across the world. These range from sheer numbers to be the only search engine available. These are the most commonly used search engines:
1. Google
2. Bing
3. Baidu (Chinese search engine - This is due to the large population in China)
4. Yandex (Russia)
5. DuckDuckGo
6. Yahoo!
7. Contextual Web Search
Another to mention would be Yippy Search. This search engine is focused on uncovering or locating hard-to-find information typically located within the deep web.