Pay per click (PPC) is an advertising model used on search engines, advertising networks, websites or blogs. Advertisers only pay when a user clicks on an ad to visit the advertiser’s website.

Advertisers bid on keywords that will be used as search terms when they are looking for a product or service. When a user types a keyword query matching the advertiser’s keyword list, or views a page with relevant content, the advertiser’s ad may be shown.

These ads are called a “Sponsored link” or “sponsored ads” and appear on search engine results pages, or anywhere a webmaster or blogger chooses on a content page.

Picked and edited from Wikipedia.

If you don’t know what Google Adsense is, then you must be living under the rock for ages already. Adsense is the most well known Pay Per Click online advertisement in the whole world.

Adsense ads are widely used in most websites because it is one of the highest paying PPC ad and its so easy to setup Adsense in websites.

Adsense ads can be place almost in everywhere on a website. When visitor click on advertisements displayed by Google, they will generate revenues for webmasters.