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Learn how RubyGems works, and how to make your own.
The RubyGems software allows you to easily download, install, and use ruby software packages on your system. The software package is called a "gem" and contains a package Ruby application or library.
Gems can be used to extend or modify functionality in Ruby applications. Commonly they're used to distribute reusable functionality that is shared with other Rubyists for use in their applications and libraries. Some gems provide command line utilities to help automate tasks and speed up your work.