Very Basic Newbie Question

... from an "oldie".

What is the main purpose of the link for the download to antville? I never really noticed it before. Is it for use only by those who are going to run antville on a server? If not for that reason, could someone explain it to me please? (Be easy on me - I am learning all "this" coding on my own and never had classes or a direct method of learning how to use html, ftp, templates, etc. In fact, I am hoping to learn more about the RSS feeds and the use of CSS - but at present it is the antville blog I presently have that I am trying to clean up.