PPC stands for pay per click this is whereby you pay for every click that comes to your website from the referring website (mostly but not always search engines).You can start the process by visiting google and typing adwords on the address bar.
Wow, you seriously need to do some research! Did you try Googling the stuff up? You should get good information. Also look for official sites from Google where the process would be described. You may then graduate to other PPC advertising
PPC is a pay-per-click campaign where you pay the advertisers only when a user clicks on your ad. Search engines(google adwords, Microsoft adcenter, Yahoo marketing, digital point ads) display your ads based on keywords you are bidding for. The cost depends on how competitive the keyword is. With PPC campaigns, you need to be careful with the message you display on the ad, if you make the ad too enticing and do not deliver the promise on the website, you would loose money as conversions would be less. Some content publishing sites also agree to display PPC ads, in this case you can do banner exchanges, revenue sharing or pay per conversion only.