A little example to illustrate how mixins work in Ruby

mixins1.rb

module ModuleExample
  def self.hello_world
    puts 'This is a static hello world from a module'
  end

  def hello_world
    puts 'This is a non static hello world from a module'
  end
end

class MixedOne
  include ModuleExample
end

mixed_class_instance = MixedOne.new
mixed_class_instance.hello_world

ModuleExample::hello_world

begin
  MixedOne::hello_world
rescue NoMethodError
  puts 'The static hello world is only avaliable within the module'
end