Pay per click or PPC advertising is paying for advertising on a performance basis.
The ads that appear on the right side a Google search results page are PPC Ads. The advertiser has agreed to pay an amount for each time a surfer clicks on their PPC ad.
PPC
PPC can cost anywhere from a few cents per click to dollars. It depends upon the desirability of the targeted keywords. Bidding for the keyword will determine your order on the results pages. Bid more and your PPC ad will appear higher in the list.
Most PPC campaigns are setup on a monthly budget.
"Our monthly online ad budget has grown to nearly $100k and produces sales 10x this expenditure."