Pay-per-click Advertising - Pay Per Click (PPC) is an advertising model used on search engines, advertising networks, and content sites, such as news websites, in which advertisers pay their host only when their ad is clicked. With search engines, advertisers typically bid on keywords and keyphrases relevant to their product offering or potential customers. Content sites commonly charge a fixed price per click rather than use a bidding system.

• Google Adwords
• Yahoo Search Marketing
• Microsoft AdCenter
• Ask.com
• Looksmart
• Content Advertising