What is RVM
RVM is a command-line tool for managing multiple ruby versions and also uses a separate gemset for each rails app.
RVM is a command-line tool that allows you to easily install, manage, and work with multiple ruby environments from interpreters to sets of gems.
[ source: https://rvm.io/ (official rvm website) ]
Ruby Version Manager, often abbreviated as RVM, is a software platform for Unix-like operating systems designed to manage multiple installations of Ruby on the same device. The entire ruby environment including the Ruby interpreter installed RubyGems, and documentation is partitioned.
[ source: Wikipedia ]
Why we need RVM
Let’s see an example.
Suppose, you have installed Ruby version 2.4.1 and created a rails project with Rails version 5.1
Fews days later you want to run another rails app with Ruby version ruby-2.6.1
Now you will uninstall Ruby version 2.4.1 and install Ruby version ruby-2.6.1, right?
If the answer is: I am not sure what to do!
Then RVM is the right solution for UNIX-like operating systems.
