RUBY is a dynamic (interpreted), open source programming (scripting) language WITH A FOCUS ON convention over messy configuration, Its elegant syntax attributes to its simplicity and productivity(ITS LIGHTWEIGHT !!)in object-oriented programming.
This should giv yu a hang of it (for now)
NOW wats Ruby On Rails (or RoR).....mmmmmmmmmmmmmm...its a "full-stack"(meaning it provides "Convention over configuration" and "Dont Repeat Yourself" features, on both Client-as-well-as-Server side features(!!), and leads the race among next-genre of web app frameworks ...highlighting features such as "scaffolding", "object-relational mapping" and simple installation. The FULL STACK means that it supports an "MVC" (Model-View-Controller) architecture [yep! :-)]...back to track...RoR is a "full stack" web application famework , written in Ruby (bling! bling!).
It aims to increase the speed and ease with which database-driven web sites can be created, and offers skeleton code frameworks (scaffolding) from the outset.
Some SW Companies tend to stay safe , means they are legacy..like teh Hanging Gradens of Babylon (implies, --> its now available only in pictures..yu c d point ?)...which donot wish to exploit (sorry bad word, but kinda fits in wen lean mean business is in play (the only exception I can currently think of, is http://www.sumerusoftwaresolutions.com, Technologists with Conscience at VASUDHA EVA KUTUMBAKAM :) ) the best of new potential technology, because there is a disconnect among the bushy-bearded dodge-ball enthusiast managers towards any new technology (not that Ruby is new) ....and also that, among programmers and developers there is this "opinion" ("popular opinion is the greatest lie in the world." - Thomas Carlyle) that development is done only for developments sake so that their careers are (SEEMINGLY) safe ...but for technologists who have a vision beyond sight, who wish to do "smart work" (by smart work I mean those who wish to use newer technologies, not the "copy-paste" jobs that SW Engineers do) it boils down to the bling bling technologies like RoR (You-Know-Who), where you are "heard" and "seen" and yur contributions add value to a FUN, LIGHT WEIGHT, and SMART programming community around the "flat" globe.