Ruby and Its World(Chapter 15 of Programming Ruby)

　　RubyGems is a standardized packaging and installation framework for Ruby libraries and applications. RubyGems makes it easy to locate, install, upgrade, and uninstall Ruby packages.

　　Rake was initially implemented as a Ruby version of Make, the common build utility. However, calling Rake a build utility is to miss its true power. Really, Rake is an automation tool—it’s a way of putting all those tasks that you perform in a project into one neat and tidy place.