RSS feed (Rich Site Summary or Really Simple Syndication) is an easy way to get the most recently published information from a blog, website, journal, newspaper, organization and databases. RSS feed saves you time by letting you know when content is updated.
This orange RSS icon indicates that the website you are using has RSS feed that you can follow.
Learn more about some RSS Feed Readers you can try here: https://www.lifewire.com/top-free-online-rss-readers-3486649
Feed Readers like Feedly provide other options to keep track of your RSS feeds. Feedly offers both a web interface and an app so you can view your subscriptions wherever you prefer. Feedly has a free and paid version.
The RSS Feed subscription is added to the Common Feed List in Windows. To see your RSS feed tab, click on View>Explorer bars>Feeds (or use the Ctrl+Shift+G shortcut).
Then click the Feeds tab and you will see your RSS feeds listed.
To learn more about adding and removing RSS Feeds from the Windows Common Feed List check out this page.