IRB in ruby means?

what does IRB stands for and what is its purpose in ruby?

Interactive ruby shell. Its read-evaluate-print loop, so can write ruby
interactively. Immensely helpful for everyday hacks and testing stuff
out.

http://en.wikipedia.org/wiki/Interactive_Ruby_Shell

Venkatakrishnan Ganesh wrote in post #1039667:

Interactive ruby shell. Its read-evaluate-print loop, so can write ruby
interactively. Immensely helpful for everyday hacks and testing stuff
out.

http://en.wikipedia.org/wiki/Interactive_Ruby_Shell

…which would have been the first hit you would have got if you had
typed “ruby irb” into Google.