Below is the list of most widely used search engines based on the user's choice. The list is sorted in alphabetical manner and may change from time to time as the trend changes.
The Ask, also known as AJ or Ask Jeeves is a search engine from longtime in the World Wide Web. This mostly behaves similarly to the other major search engines like Google, Bing in terms or functionality and features. The results groupings are more appealing and seems to be more relevant than Google, Yahoo or Bing. Visit Ask
Bing is introduces by Microsoft in attempt to compete with Google. Formerly known as MSN Search, Bing tries to support your researching by offering suggestions in the leftmost column, while also giving you various search options across the top of the screen. It has some nice features like 'wiki' suggestions, 'visual search', and 'related searches' that might be very useful to you. Visit Bing
Cuil search engine was founded by ex-Google staff. It uses a column format like a newspaper, and it offers both tabbled and columned groups to help your searching. The results are not ranked in the same nammer that Google is known for. But Cuil.com can really be helpful in finding some rare articles or documents. Visit Cuil
The main difference of DuckDuckGo search engines is of its some slick features, like 'zero-click' information (all your answers are found on the first results page). Also the sponsored ad listing sis also less as compared with Google. Give DuckDuckGo.com a try... you might really like this clean and simple search engine. Visit DuckDuckGo
Google, no doubt is the king of 'search engine' technology. It is fast, relevant, and the largest single catalogue of Web pages available today. You can also try some other cool features that Google offer like 'images', 'maps' 'street view' 'news' and much more. Just give it a try or explore the Google Labs to find more such features. Visit Google
The Internet Archive has been taking snapshots of the entire World Wide Web for years now, allowing visitors to travel back in time to see what a web page looked like in 1995, 96, or what were the hot topics or news were in 2002. If need to travel back in time, use this search site and their popular Wayback Machine. Visit Internet Archive

Mahalo is the one of the 'human-powered' search site, employing a committee of editors to manually sift and vet thousands of pieces of content. The quality of content and relevance depends upon the judgement power of the editors. Mahalo also offers regular web searching in addition to asking questions. To learn more just give it a try. Visit Mahalo
Yahoo! is not just a search engine but it offer tons of services like: a news aggregator, a shopping center, a web directory, a horoscope, an advertisement portal, a games center, and much more. This 'web portal' breadth of choice makes this a very helpful site for Internet beginners. Visit Yahoo!
Suggest a Search Engine: If your favorite search engine is not included in this list, then you can suggest it by posting a comment.