A "Hello world" program is a computer program that outputs "Hello, world" on a display device. Because it is typically one of the simplest programs possible in most ...

http://en.wikipedia.org/wiki/Hello,_world

The Hello world program is a simple computer program that prints (or displays) the string "Hello World". It is typically one of the simplest programs possible in ...

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

A Hello world program is usually a program made by computer programmers that are new to a programming language, or to test if the compiler for this language is ...

http://simple.wikipedia.org/wiki/Hello_World_program