A blog (a portmanteau of web log) is a website where entries are written in chronological order and commonly displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.
A format for content distribution, RSS stands for Really Simple Syndication.
RSS is a system that allows a user to get automatic updates from multiple web sites whenever new content is published on these sites. It acts like a personal web reader by checking your selected sites regularly for new content. If you set up an RSS feed from the New York Times Sports section, for example, you would be notified whenever a new article was posted. The notification takes place in an RSS Reader.