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C# Is a modern, object-orientated programming (OOP) language created by Microsoft in 2002 for their all new .NET Framework. Since '02, C# has been used across many frameworks for all different types of platforms. For example; Windows has .NET Framework; Andoird & IOS have [https://www.xamarin.com/ Xamarin]; Windows, OSX, and Linux have [http://www.mono-project.com/ Mono]. There are other frameworks that support C#, but they're the well less known.