Ruby gems are pieces of software on a Rails app to do things. The following examples are gems:
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Devise lets you make/create users. It can also let you have authentication in your apps.
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Kaminari lets you paginate things so they don’t overflow the page.
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Can can can lets users have certain permissions to do certain things or visit certain pages.
The gem in Ruby is a library. The word “Gem” reminds me of something precious. In some of the books I read, I have come across gemstones. How precious these stones are! Ruby gem allows authentication. Authentication includes logging into an app and creating new accounts. Ruby gem is a perfect fit.
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