"RSS" is about getting live web feeds directly to your computer. RSS takes the latest headlines from different web sites, and pushes those headlines down to your computer for quick scanning.
The acronym RSS stands for many versions of the same thing.
Really Simple Syndication
Rich Site Summary (RSS 0.91)
RDF Site Summary (RSS 0.9 and 1.0)
Real-time Simple Syndication (RSS 2.0)