What are the sources Of website Income

Advertising :  Selling space or placing ads is one of the prime way to make money online through a website.Many programs like adsense,yahoo,adcenter and others pay you for showing ads on your website.They might be cpc or cpm or other types.
Link Selling : Many people sell links from their webpages to other websites.Google page rank is one of the important aspect for this along with website popularity and content.

Selling product reviews or website reviews : You have to post on your own blog about other websites or products which will create a buzz for the advertiser and for you will lead to income.

Selling through affiliate adverting : You can sell products from your site for others.All you have to do is join the affiliate network like ebay,amazon etc and then place their links on your site and try to persuade the visitors to buy them through clicking on your links.It will lead you to some very good income as commission.

Sell your own products : you can sell your own product through site.Like for example if you are kite manufacturer then you can sell it through site as you can get orders online and you have to fulfill them.