[Rails] rubygems, rubygems-bundler and bundler

Hello,

I would like to exactly know how rubygems-bundler and bundler make
difference in Rails applications.
I am using RVM to manage different Ruby versions and ruby gems.
When I have a look into @global gemset for each ruby version, I can see
four gems have been by default installed. (rvm, rubygems-bundler,
bundler and rake).

I am confused by Rubygems, bundler and rubygems-bundler.
Can anyone kindly walk me through the differences between them?

Thanks in advance.
Christopher

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