What is an RSS/Atom Feed?

RSS and Atom are standards commonly used by websites to allow users to subscribe to new content (like news, blog articles, podcasts, etc.). To subscribe to a feed you can use a feed reader like:

What is a source?

Sources define from where and how to get new content. Source have filters (like minimum score of a post, category, tags, etc.) to allow you to subscribe only to what you're interested in.

Sources are grouped in categories. Each category has a feed and optionaly a periodic email summary.

What is a category?

A category is a group of sources. Each category has a feed. By changing the settings, you can also receive a periodic email summary at a defined interval (once a day, once a week, etc.).