Contextual Advertisements

After you add a few pages of good content and get regular and new visitors every day, you are ready to place advertisements on your blog and it's time to earn some money.
When you sign up for contextual ad program, the ad agent will provide you with a piece of code that you will add to your blog. Now, a small box will appear next to your content.
When a visitor reads your blog, the Ad box will display information about other sites that are related to the content of your blog page. For example, if your visitor is reading about how to prepare well for examination, advertisements for products and services such as educational loan, exam preparation guides and jobs will be displayed. Some of your visitors may like to explore those ad offers and click on those offers. For introducing a visitor to that offer, the ad agent will pay you some money.
Though there are many contextual ad programs, we will first try our hands on Google AdSense. Why?
Google AdSense
Google AdSense is the most popular ad program in the world. Google AdSense is the program that can give you advertising revenue from each page on your website—with a minimal investment in time and no additional resources.
If you have good content, it is easy to get approval from Google. Blogger is a product of Google. It has built in tools to add AdSense to your blog.
Becoming an AdSense publisher is simple. All it takes is a single online application. Once you are approved, AdSense takes only minutes to set-up.
AdSense delivers relevant text and image ads that are precisely targeted to your site and your site content. And when you add a Google search box to your site, AdSense delivers relevant text ads that are targeted to the Google search results pages generated by your visitors’ search request.