Every blog publishes what is called an feed which can be read by many other different websites… As Google explains…
What are feeds?
I see "RSS", "XML", and "Atom" out there, but I don't know how I might use these links when I find them.
Feeds are a way for websites large and small to distribute their content well beyond just visitors using browsers. Feeds permit subscription to regular updates, delivered automatically via a web portal, news reader, or in some cases good old email. Feeds also make it possible for site content to be packaged into "widgets," "gadgets," mobile devices, and other bite-sized technologies that make it possible to display blogs, podcasts, and major news/sports/weather/whatever headlines just about anywhere.
Here is a 5 minute video which explains What is Feedburner and What are RSS feeds?
The question you should be asking yourself is “why would I want to use Feedburner when my blog system already creates a feed? I can allow others to just post my feed into their reader of choice or widget or mobile device or whatever. The reason is that Feedburner does this for almost every type of reader etc with a single click of a button and so much more. This is the reason I decided to use Feedburner rather than my original feed.
Feedburner’s tagline is FeedBurner delivers the world's subscriptions wherever they need to go. Publish a feed for text or podcasting?
This video will explain step by step the process of using Feedburner
Feedburner will increase your traffic and you will find this process to be useful if you are using a blog as your main social media “sun”