The ability of a computer program to examine and modify the structure and behavior (specifically the values, meta-data, properties and functions) of the program at runtime.

A programming paradigm based on the concept of "objects", which are data structures that contain data, in the form of fields, often known as attributes; and code, in the form of procedures, often known as methods.

A fundamental style of computer programming, serving as a way of building the structure and elements of computer programs.

Creator of the Ruby programming language.

Ruby does NOT require a keyword when declaring variables. Ruby uses = (assignment operator) to assign values to variables.

print - takes whatever you give it and prints it to the screenExample:print "Hello World!"

puts - adds a new (blank) line after the thing you want to print. NOT used with print, use puts rather than print.Example:puts "Hello World!"

Text that Ruby won't run as code. Single Line Comments are declared using #. Comments are good for clarifying code and reminders.

The Ruby method for getting input from the user.