C#, pronounced c sharp, is a computer language used to give instructions that tell the computer what to do, how to do it, and when to do it. This is a universal language that is used on many operating systems, including Microsoft Windows. C# is one of the languages used in the Microsoft .NET Framework. The Microsoft .NET Framework is a library of objects that create or draw things on the computer. The C# language is used to create applications that display on a black window referred to as the DOS prompt or DOS window. Those are the types of applications we will create in our lessons.Although C# is derived from the C programming language, it has features such as garbage collection that allow beginners to become proficient in C# more quickly than in C or C++. Similar to Java, it is object-oriented, comes with an extensive class library, and supports exception handling, multiple types of polymorphism, and separation of interfaces from implementations. Those features, combined with its powerful development tools, multi-platform support, and generics, make C# a good choice for many types of software development projects: rapid application development projects, projects implemented by individuals or large or small teams, Internet applications, and projects with strict reliability requirements.