Pay-per-click, or PPC advertising is one of the most common means of driving traffic to your website and therefore of making money.
Pay per click works by first placing your ads on other web sites, then placing other people's ads on your web site.
 You pay a certain amount for each ad that is placed for you, sometimes as a CPC, or cost-per-click.
 However, you also receive a certain amount for every ad on your website that is clicked and takes someone to the advertised site.
 It's quite a simple concept, though there are complex techniques that can improve the effectiveness of Pay per click advertising.
Here are some important words and ideas you need to know to get started with PPC advertising

• Keywords.
   This vital idea refers to certain words that will lead searchers to your web site.
   It is simply a list of 10 or more words that will connect to something that you've written, and can guide the searcher toward your site.
   
• PPC providers.
   These are companies that can place these ads for you.
   You allot a certain amount of money to them each month, and they use it to place your ads elsewhere, and to place others' ads on your site.
   The most well known of these Pay per click providers is Google AdWords, but there's also Yahoo! Search Marketing, AdBrite, ValueMarketing, and Microsoft adCenter that can do this for you.
  
• Click-through rate.
   This is the rate at which your ads cause someone to click on them and be connected to your site.
   A good ad has a comparatively high click-through rate, which your PPC provider can tell you about.
   If your click-through rate is low, you might want to change the content of your ad to attract more clicks.