A blogroll is a collection of links to other blogs that a blogger follows. A blogger can add links to their blogroll by copying and pasting URLs into a blog post or by linking directly to blogroll entries from within a blog post.
When readers click on a link in a blog post, they are taken to the website or blog that the link leads to.
Blogrolls help bloggers connect with other bloggers and provide readers with easy access to the blogs that interest them. In addition, blogrolls can help promote the credibility of a blogger’s work by displaying the links of other reputable bloggers.
A conclusion would be that, while not essential for all bloggers, a well-maintained blogroll can provide readers with valuable information and help promote the credibility of a blogger’s work.