A blogroll is a collection of links to other blogs. Blogrolls are found on most blogs. Blogrolling is the original and most-respected service, although any link list is commonly referred to as a “blogroll”.
Various blog authors have different criteria for including other blogs on their blogrolls. These range from matters of common interest to frequency of updates and posts to community relations to link exchange policies. Some blogrolls also simply consist of the list of blogs an author reads. Some news aggregators allow their users to export the list directly to a blog.
With the advent of syndicated newsfeeds, even blogrolls can be and are being syndicated. OPML is one of the popular ways to syndicate a blogroll if a blog author wants others to be able to access the blogs in their blogroll.