Functions are a set of instructions that return one value. Functions that exist in an object are typically called methods. A function is declared using the def keyword. We close a function with the end keyword. ruby def greeting puts "Hello, World!"

A method and function are exactly the same thing in Ruby. In other languages, a function refers to a group of code that performs a specific task and method would be a function that is associated with an object (class). For Ruby, everything is an object so a function and method are the same thing.

Ruby methods are very similar to functions in any other programming language. Ruby methods are used to bundle one or more repeatable statements into a single unit. Method names should begin with a lowercase letter. If you begin a method name with an uppercase letter, Ruby might think that it is a constant and hence can parse the call incorrectly.

Functions: A function is a reusable block of code that performs a specific task. It is defined outside of any class or module and can be called from anywhere within the program. Methods: A method, on the other hand, is closely associated with objects and is defined within a class or module.

A method in Ruby is a set of expressions that returns a value. With methods, one can organize their code into subroutines that can be easily invoked from other areas of their program. Other languages sometimes refer to this as a function. A method may be defined as a part of a class or separately.