How sites earn money?

I wanted to know how sites earn money.....
for example- Google.... its a search engine, we dont pay anything for searching, but still its earning money.....

WHERE THIS MONEY COME FROM?

another example is facebook..... its ceo is the youngest billionare..... i mean how it all happens..... how they get money, and whats the whole structure?

plz do tell me.... im very eager 2 know all about this stuff.

companies that sell crap pay google to have their ad there so people like you see it. and google can prove how many people visit the site so can charge more if more people click on it.

By putting commercials on them.

cant you see ads when you search for something on google...

Initially google was a non profitable organization which helped people to find and access information faster and better .. but gradually it has gone commercial , now generating billions of dollars by advertisement alone...

if you do not know what i am saying please search for
" forex enterprise overview " in google , and what you see on the right hand side of the screen are ads.

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It is through affiliate program, ie ads in your site placed automatically by google or ebay or, yahoo or others.
For detail information and process please visit'
http://www.emoneyinfo.info/ap.htm

Gora.

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