RSS stands for Really Simple Syndication. Per Wikipedia (exit Lottery website and opens in a new window) :

RSS makes it possible for people to keep up with their favorite web sites in an automated manner that's easier than checking them manually.

RSS content can be read using software called a "feed reader" or an "aggregator." The user subscribes to a feed by entering the feed's link into the reader or by clicking an RSS icon in a browser that initiates the subscription process. The reader checks the user's subscribed feeds regularly for new content, downloading any updates that it finds.

To view the content of the feeds, click on the topic. To subscribe to these feeds, click on the RSS version or icon.

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Wisconsin Lottery Feeds

Topic	Subscribe to RSS version
Estimated Upcoming Jackpot Amounts	Subscribe
Winning Numbers	Subscribe
Press Releases	Subscribe