There are many search engines to choose from, here are some of the popular ones:
On most search engines some of the listings are sponsored (those who pay the most are listed higher) and some of the listings are 'natural' (the search engine 'found' those sites and ranks them highly). A few years ago almost all search engine listings were free. However, in the last year or two, payed search engine listing has become big business (for the search engines). This means that increasingly the results pages on the big search engines includes more and more sponsored listings. The huge potential profit in the search business means you can expect the search 'landscape' to chage a lot over the next few years as the big search engines fight it out to provide more popular engines are better ways to make money.
Its not that there is anything wrong with the sponsored listings, its just that you may want to know and understand why certain sites are listed. So, if you see a note saying 'Sponsored' (or something similar) then you know those sites are listed there because they paid to be in that position.
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