'Feed'?

Over on the right margin it says, "Subscribe to this blog's feed." I haven't the slightest idea what that means. I didn't even know I had a "feed." I'll try and figure out what that means and let all my readers (i.e. myself) know.

I wish the margins for this center column were larger. A lot of space is taken up on the far left and far right of this blog by the background grey margins where you can't post anything. Unusable space, but you get what you pay for.