What is Bundler?
Bundler is a gem that helps you manage an application's gem dependencies. It works by installing all gems required for your application in your project's bundler environment. The default behavior is to bundle gems into a vendor/bundle directory within your app. There are many ways to customize the way gems are installed using Bundler. For example, you can install gems directly into your app, but keep them up-to-date with Bundler by changing your bundle specification. This may be useful if you want to share the same Gemfile between projects, but also wanted some flexibility on where certain gems are installed or store