PPC stands for "cost per click"... the idea is you pay vendors like Google Adwords to send targeted traffic to your website. Perhaps you can elaborate on your question and we can help you better?
PPC works on the basis of keywords. When an online seller targets a specific customer base for his product or service and wants to advertise to this particular niche group, he bids on keywords - the words that potential customers would type on the search engine. To illustrate, let's pretend you're selling gift baskets. In order to spot you immediately, you hope that a potential customer types "gift baskets" on either Google, Yahoo or MSN. The searcher would then see your ad, click on it and is ready to pay for half a dozen gift baskets. The ads that appear for your online business are called "sponsored links". But you, as the advertiser, only pay when the searcher actually clicks on the ad.
i dont biliv someone still ask this question. Maybe there's lots of newbie still can not catch up to this.