What is FL Studio?

FL Studio (formerly known as FruityLoops) is a digital audio workstation developed by the Belgian company Image-Line. FL Studio features a graphical user interface based on a pattern-based music sequencer. The program is available in four different editions for Microsoft Windows, including FL Studio Express, Fruity Edition, Producer Edition, and the Signature Bundle. Image-Line offers lifetime free updates to the program, meaning customers receive for free all future updates of the software. Image-Line also develops FL Studio Mobile for the iPod Touch, iPhone, and iPad.

FL Studio can be used as a VST instrument in other audio workstation programs and will also function as a ReWire client. Image-Line also offers other VST instruments and audio applications. FL Studio is used by electronic musicians and DJs such as Afrojack and 9th Wonder.

Link.
http://en.wikipedia.org/wiki/Flstudio