Here isa good explaination rss feeds

http://en.wikipedia.org/wiki/RSS_(file_format)

RSS Feeds help you visitors keep up the site content. All major news website have RSS. With so many new and links being posted everyday, you sometimes miss them. With RSS feed, you can keep track of all updates.

also check out

feedburner.com

i heard you can create RSS feed for your blog suing feedburner.

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