What is Ruby?

Answer 1

Ruby is a programming language.

This provides an overview:

http://en.wikipedia.org/wiki/Ruby_%28programming_language%29

This is the official site for Ruby:

http://www.ruby-lang.org/en/

Answer 2

Ruby is a dynamic, reflective, general-purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features. Ruby originated in Japan during the mid-1990s and was first developed and designed by Yukihiro "Matz" Matsumoto. It was influenced primarily by Perl, Smalltalk, Eiffel, and Lisp.