Paid Search or Pay-Per-Click (PPC) is Internet advertising for websites; in this advertising model the advertiser only pays the host of the advert when the advert has been clicked.

The advertising can be either on search engine result pages or on content pages. In the case of search engine results pages like Google, advertisers typically will bid on keywords or key phrases relevant to the target market.

If the advert appears on a content page, the advertiser can be charged a fixed price per click rather than the bidding system.