If you are using a certain search engine like Google more than others, it is probably because you are provided the better search results compared to the ones you would rarely use. In this case, that particular search engine is benefiting from you. In what way, you may ask? The answer is simply because of your part in helping them gain their much needed revenues. That very small role that you play is when you decide to click on an ad that is on their page. The companies where these ads are coming from would then pay the search engine. This is what is referred to as Pay Per Click or PPC advertising. You can imagine the millions of other users like you who rely mainly on that search engine, and the role that they are unconsciously playing in helping generate money for the search engine.
Search engines have indices of sites that must be filled with content that vary in form. Usual content includes documents, videos, photographs and Web pages. What happens is that the search engine deploys crawlers or robots in scanning the Internet for content to be included in their index and rank these content depending on various values and factors. Of course, the more content they have, the most likely it is for users to consider them as a reliable site.
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