The purpose of a blog feed is to provide a continuous stream of updates from a blog site. When you add a blog feed to your reader, you are subscribing to receive new posts as they are published.
This allows you to read the latest posts without having to visit the blog site every time.
A blog feed is also known as a blogroll, and it is a list of blogs that you can subscribe to. When you add a blog feed, the blog site will send a notification each time a new post is published on one of the blogs in the feed.
You can then click on the link in the notification to read the post.
Blog feeds are useful for people who want to read about multiple topics in one place. For example, you might use a blog feed to read about fashion, travel, and recipes.
This way, you can stay up-to-date on all of your favorite topics without having to visit each individual blog site every time.