Source of income of websites?

Many websites provides free email and chat services etc. From where on earth they find money to provide these services free to ancestors?
What is the benefit to them to provide these services?

Answers:
Companies are competent to grant services and items for free because of these possible reason:

1 - they earn through exposure and the free giveaway are their basic come-ons for population to pop in their site

2 - they proposition the unsophisticated items for free to procure users hooked to their products, and later submission premium version near advanced features for fees. Example is Skype

3 - the company have low pockets (e.g. activity wherewithal funding, etc) and they are competent to bequeath away their products for free as they build their brand and develop traffic.
Generally how it works is advertisement on the sites. The advervising companies settle these places to enjoy their ad on the sites, which within turn give the website potential to form money and they outdo it on to you. Free email, chat rooms, games, etc.
People earn money when someone clicks on an classified ad on their site.


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