Ruby is a pure object-oriented programming language. It was created in 1993 by Yukihiro Matsumoto。
Ruby is "A Programmers Best Friend".
Ruby has features that are similar to those of Smalltalk, Perl, and Python. Perl, Python, and Smalltalk are scripting languages. Smalltalk is a true object-oriented language. Ruby, like Smalltalk, is a perfect object-oriented language. Using Ruby syntax is much easier than using Smalltalk syntax.
The app provide the Tutorial of Ruby.