It's very simple. As I said, when the keywords match, the advertisement gets displayed. When people click on these ads, you earn for every click they make. It's pretty simple to understand. To display the ads on your blog, you need to add a small piece of code on your blog. It's very simple. Once you sign up with them, you will be asked to verify your email address. After you complete the initial setup, login to the dashboard and navigate to "Integration Guide".
Infolinks offer the 4 customizations namely, the ability to change the color, style of underline (dotted or double underlined), set the maximum number of links per page, category which best suits your blog. It is pretty easy to customize. Just login to your Infolinks Dashboard and navigate to "Integration Guide>>Advanced Integration Wizard". Once you reach this page, it's going to be self explanatory.
One main advantage with Infolinks is that you can happily run the Infolinks ad with the Google Adsense. I guarantee you that there will be no PR ban nor the cancellation of Adsense account. The other advantage would be the newly introduced related tags. You may place them below every post or below the title of your post or below the navigation bar to increase your earnings by more than 30%.
One main drawback with Infolinks is that they don't match exactly with the content of our blog rather they match with the normal words in our blog. To illustrate this, consider the following example. I found the word "matching" that displays a link to "shaadi.com", which is completely not in match with my blog's content. This is the only drawback which I found about Infolinks.
If you know more about Infolinks, please share your view via comments. Comments are always appreciated and we always love to hear from you!!!