Its a list of blogs. To be added to someone's blog roll you'll need to send them a request or they'll have to like your site
It can vary depending on their site. If they have a lot of traffic, or high PR it will cost you more to have your link placed there than it would a normal blog. Also if you have a blog thats similar they may be interested in a link exchange if your site has something to offer.
If they interest in link exchange then they exchange the links for free of cost, or else the charges will be based upon their blog quality, traffice, and PR.
Its hard to find But if you want to exchange then go and search at Link Exchange section of this forum under BST. DON.
I don't know how to explain it. OK have you make site with wordpress. On the homepage of the default theme, pay attention to the sidebar. Have you seen the blogroll. It is a type of friend links or sponsor's links.
You should not ask questions like this because it exposes you. And also it exposes you to certain manipulations by some unethical persons. Some people may harm you if they come to know that you dont know anything.
If you blog about World of Warcraft (MMORPG) like me. You can get blogrolled by other fellow WoW bloggers in a breeze.