Reciprocal links

What are reciprocal links? You must have heard a lot about this. It is nothing but a link exchange with other website . You visit some website and then if you wish to add a link on you site then u can ask the owner to add your link as well. It is very difficult to get links so easily from well rated pages because why will they give you link what will they gain from it.So whenever you wish to exchange link and if your site is not popular then first add the other website link and inform that you have linked their website and then request them to add your's. Let do this and then see how adsense and blog can make money with you