Pay per click Marketing(PPCM) is an Internet advertising model used on search engines, advertising networks, and content website's, such as blog's, where advertisers only pay when a user actually clicks on an advertisement to visit the advertisers' website. With search engines, advertisers typically bid on keyword phrases relevant to their target market. When a user types a keyword query matching an advertiser's keyword list, or views a web page with relevant content, the advertisements may be displayed. Such advertisements are called sponsored links or sponsored ads, and appear adjacent to or above the "natural" or organic results on search engine results pages, or anywhere a webmaster or blogger chooses on a content page. Content website's commonly charge a fixed price for a click rather than use a bidding mechanism.

Although many PPC providers exist, Google Ad Words, Yahoo! Search Marketing, and Microsoft ad Center are the largest network operators as of 2007. Minimum prices per click, often referred to as costs per click (CPC), vary depending on the search engine and the level of competition for a particular phrase or keyword list—with some CPC's as low as US$0.01. Very popular search terms can cost much more on popular search engines.

Credits: Wikipedia.