Introduction

Ruby on Rails is a web application framework (i.e. a set of programs and
libraries that have already applications ready to use). Ruby stems 
from  Smalltalk wich is an object-oriented language, 
Python and Perl that are interpreted languages.

Rails is a web-application framework. It takes less line to code
and less time to be executed. It includes the needed utilities to 
create a database-driven web applications using the MVC 
(Model-View-Controller) pattern.

Ruby is an interpreted scripting language and 
an object-oriented programming, where  variable 
declarations are unnecessary and not typed.

Rails works with many database systems, such as MySQL, Oracle, 
DB2 and SQL Server.

Ruby comes with three programs: ERb(Embedded Ruby), 
that allow us inserting Ruby codes inside an HTML file, eval 
that allows, over the prompt, showing the values of each entered 
expression, and irb prompt called Interactive Ruby Shell.

As PHP JSP or ASP do, the Ruby codes can be embedded in 
a HTML document using appropriate tags, spaecially <% and 
%> code. The code is executed the JSP way when It is enclosed 
between those tags as  <%= and %>.

Ruby & Rails .. doing quickly and easily ..