RSS Feeds
RSS (some people say it stands for Rich Site Summary, some people say it stands for Really Simple Syndication) is a format for publishing web content. It's used to "push" timely information and updates to people who subscribe to RSS "feeds". What's so cool about it is you can collect a bunch of feeds in one place (your reader or news aggregator), log in whenever you like, and see what's new. You don't have to visit all the web sites one at a time, and you don't have to waste your time with old news.
See the library's guide to Keeping Current with News and Research for a more detailed explanation of RSS.