Atom feeds are like RSS feeds: both subscribe and display new content from specific websites "live". To add my blog to your reader, add this link (/feed.xml) to your feed-reading program. Most RSS readers also support the atom standard. You will now be notified of all my new blog posts.
I got this working on my site via the simple plugin here: https://github.com/lektor/lektor-atom.
Here's an example of how my feed may look in your reader. You even get a summary of the content and a direct link.