Gemfile

A Gemfile is a file used in Ruby programming projects to specify the libraries, called "gems," that the project depends on. It clearly lists the needed gems and their versions, ensuring that everyone working on the project uses consistent tools. This helps avoid compatibility issues and makes setting up the project straightforward. Think of it as a shopping list of ingredients required to build and run the application smoothly. The Gemfile, along with a tool called Bundler, automates the process of installing the right gems, keeping the development environment predictable and manageable.