MonoTouch is a software development kit for Mac OS X that lets you use .NET programming languages to create native applications for Apple iPhone and Apple iPod Touch devices.

MonoTouch allows developers to use the .NET framework and more efficient programming languages, such as C#, to create applications that run on the iPhone and can take advantage of native iPhone APIs.

Developers can test MonoTouch applications on the iPhone simulator, as well as physical hardware, and can distribute MonoTouch applications on Apple's App Store.