Adsense is an adnetwork from Google that can be used by small, medium as well as large publishers. I have been using adsense on my blog since some time. In the first few months, I did not make any money. However, in the past two months, I am making around $30 every month. Adsense will send you you payment automatically once you reach $100. In order to use adsense you need a self hosted blog. You can also use adsense on your blogger blog or youtube videos.