Swift is a new programming language created by Apple with a couple of interesting programming paradigms and differences to the big established languages. Like Objective-C Swift is created for iOS, OS X and watchOS development und should be a safer, faster and more powerful alternative to Objective-C.
If you want to know more about, click on this blog post, published on NovaTec's blog (the company I'm working for):
http://blog.novatec-gmbh.de/swift-2-introduction-comparison/
