Many bloggers have been blogging away for months, sometimes years without realizing the potential for making money by using one (or several) of the different types of advertisements. There are many different types of ads that can be shown and it's important to have the right type for your blog. Read below to see which kinds of ads might be right for your website or blog.

Pay Per Click - Google AdSense ads spider your page looking for keywords, which match then match up to ads. These type of ads are generally pay-per-click, which can pay high or low amounts depending on which keywords it picks up. Google Ad Sense is a controversial subject among many bloggers with complaints that they are too strict and have banned users without cause. I've had no problems, so I'm still a happy Ad Sense user. There are other ad programs similar to this scheme such as Yahoo's ad campaign.

Contracted Payment Scheme - There are many ad types that offer webmasters the opportunity to get a set rate for an ad slot per month. These types of ads usually feature, but not always, one company's ad which does not change. An example of this ad scheme that used by Matched.co.uk which currently pays users £3 per month per ad. This method is becoming increasingly popular amongst top bloggers, but they generally hire out their own ad space instead of going through an agency such as Matched.co.uk.

Paid Blogging - This is another ad program that is considered controversial by Google standards as many bloggers participating in this ad scheme have been experiencing the lowering of their page ranks. Paid blogging is a program where users are given the opportunity to write blog posts to post in their blogs for a set amount of pay per post. The earnings can range anywhere from $5 to several hundred dollars. This is also a method that some high income bloggers use, but allow advertisers to buy directly through their blog instead of going through a program such as PayPerPost.

Affiliate Earnings - This is a program that allows users to show products they like on their blogs. These products link back to sites where they can be purchased. If someone buys a product through a blog, that blogger gets a certain percentage of whatever the item sells for. An example of this method is Chitika.