It used to be that you had to create a new account for each website you visit in order to get updates on your subscriptions and whatnot. However, this requires you to go over each individual website, kind of wating your time.
RSS (Really Simple Syndication) offers a streamlined solution to get updates scattered accross multiple websites, allowing you to gather updates and aggregate them in a single, consolidated feed. This way, the new contents are automatically found and the time used to manually check each website is eliminated, helping you curate your own personalized news hub.