Pay per click or PPC is the way of prioritizing your website on the search engine results by the use of keywords for advertising.
In advertisements you use the words which are commonly searched to convey your information about the services or products.
Bidding is an essential feature of PPC ads – the higher your bidding is, the higher you can place your advertisement.
In PPC ads you need to pay only after any visitor follows to your site through a link. That means you have to bear the cost for those traffic only which visit your site. In one word you can say that you just pay only for those traffics which get to your website.