You should try several to find the one that you like best. They search the entire Web looking for keywords that you've asked them to find. They look for web pages with the words you've requested and display their titles, URL's, and first lines for you examine, usually in a priority order explained on the engine's home page. You can then click links to the web pages that appear to be helpful to you. The real differences between the search engines is how thoroughly they search the Web and how they organize the information that they find.
Most search engines organize their findings by relevance and date.
Some provide categories within which you can confine your search. Formulating Effective Search Questions. The way that you formulate your search question is directly proportional to the success you will have in finding what you want to find. It is not uncommon for poorly defined search questions to return hundreds of thousands of responses. The search words chocolate chip cookies will return every web page that contains ANY of the three words chocolate, chip, or cookies.