For example, RSS is being used on CNN Political Market so you can be kept up to date on new markets, markets that are closing soon, price changes, etc. without having to always come to the marketplace.

To read an RSS feed, you need something called an "RSS Reader." Many browsers like Firefox, Internet Explorer 7, and Safari have RSS readers built in. You can also download an RSS reader. To start using an RSS feed, just click on an RSS link and follow the instructions in your browser or copy/paste the URL in to your RSS reader. Once it's saved in your reader, whenever there is an update, it will automatically be sent to you. It's that easy!