Some of the most visited and widely used search engines in the world were:
1. **Google:** Undoubtedly the most visited search engine globally, with a dominant market share.
2. **Bing:** Microsoft's search engine, known for providing an alternative to Google.
3. **Yahoo:** Although its popularity has declined, Yahoo Search is still used by a significant number of users.
4. **Baidu:** The leading search engine in China, serving a massive user base in the country.
5. **Yandex:** The primary search engine in Russia, known for its focus on the Russian-speaking audience.
Keep in mind that the popularity of search engines can vary by region due to factors like government regulations, language preferences, and cultural influences. For the most current and accurate information, it's recommended to check recent statistics or market share reports.