Pay Per Click (PPC) is an advertising model used to describe when advertisers pay their host when their advertisements are clicked. Some search engines allow advertisers to bid on certain relevant keywords and phrases.
The Cost Per Click (CPC) is the amount the advertiser pays each time the advertisement is clicked. Cost Per Click can range anywhere from 10 cents to $20 per click depending on the keyword terms that were chosen by the advertiser. That being said, unmanaged Pay Per Click campaigns can become very costly to an advertiser. Detailed management is necessary to keep advertising costs in line with advertising budgets.