To start off, let me explain what a "banner" is for those who don't know this yet.
Here is an example.
[Update - I moved my first website's content to KasottyBlog]
My first blog back then was Life In Kaizen Style Blog was about personal development and success.
So, books were a huge part to talk about on my blog, as I gained most of my knowledge from the books.
So, on the sidebar of a blog, I posted banners of my 4 favourite books, which lead to Amazon page for those who are interested in learning more.
This is how it looks:
This way, my blog visitors, when interested in learning more, are redirected to an Amazon page with the according book.
Once they make an order/payment, I get commissions.
So this is an example of a banner and how it works.
NEXT: How to Make A Banner to Open in A New Window