Garageband was first introduced for the Mac in January 2004. Since then, there have been several major releases, adding such features as MIDI integration and a "podcast studio." The latest release, Garageband '11, was announced in October of 2010.
Garageband for the iPad was announced on March 2, 2011. It is very similar to the OS X version. It has virtual on-screen instruments, such as keyboards and drums. In November of 2011, Apple updated Garageband to include iPhone and iPod touch support.