Search Engine Forums, SEO Forum

Pay per click (PPC) is an Internet advertising model used on search engines, advertising networks, and content sites, such as blogs, in which advertisers pay their host only when their ad is clicked. With search engines, advertisers typically bid on keyword phrases relevant to their target market. Content sites commonly charge a fixed price per click rather than use a bidding system.

PPC is just the sponsored listings sections of the website, once your budget disappears, so does your listing.
Thanks for the post.

Good one. Please explain the other terms in PPC programs like CTR,CPC etc and how they measure.

Ament to that! PPC is a good strategy to immediately boost site traffic. But it boils down to good research and keyword selection.