Is Gems Ruby or On Rails?

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I’m starting in Ruby and On Rails. I got a little confused about "Gem", it’s part of Ruby or On Rails?

Example of command below. 

gem install nome gema
ruby-on-rails ruby gem

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Gem are Ruby codes packaged to be distributed and reused by other projects, apps and so on... Just like packages are JAR in Java or as the Pecl of PHP.

The Rubygems is the manager of these packages where you can search for the Gem you need by being able to download directly to your project with Bundle and gemfile.

Therefore, Gems are from Ruby (the programming language), while Rails is the Web Framework created with Ruby (which by the way, is also a Gem, or Ruby metagem).

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