A Module is a collection of methods and constants. The methods in a module may be instance methods or module methods. Instance methods appear as methods in a class when the module is included, module methods do not. Conversely, module methods may be called without creating an encapsulating object, while instance methods may not. (See Module#module_function)

In the descriptions that follow, the parameter syml refers to a symbol, which is either a quoted string or a Symbol (such as :name).

module Mod
  include Math
  CONST = 1
  def meth
    #  ...
Mod.class              #=> Module
Mod.constants          #=> [:CONST, :PI, :E]
Mod.instance_methods   #=> [:meth]
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