This is a way to package ruby libraries/applications for distribution. rubygems provides the ability to manage concurrent versions of libraries and dependencies between those libraries. using rubygems, you can:
* download and install ruby libraries easily
* not worry about libraries a and b depending on different versions of
* easily remove libraries you no longer use
this package provides rubygems for ruby 1.8. in ruby 1.9.x, rubygems is provided with the interpreter.