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What is the C# programming language?

Joseph Gordon-Levitt

Apr 03, 2025 pm 04:15 PM

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Originally known as Cool, C# was invented by Anders Hejlsberg of Microsoft and launched in July 2000. C# is designed to suit managed and embedded systems from start to finish. For example, C# can run on your desktop computer and IoT devices such as the Raspberry Pi. C# is the main language used in the Microsoft .NET Framework, and it runs on millions of devices around the world. And, thanks to the latest version of .NET, C# can now be used to write Linux and macOS

What is the C# programming language?

What can I do with C#?

C# is useful when writing applications for Windows and macOS, and creates websites, games, embedded firmware, and more. After being compiled into an intermediate language (IL), C# can run devices with an IL interpreter on any platform.

Thanks to Mono, C# is not only for Microsoft-based projects. Mononucleosis is an open source implementation of the .NET Framework, making it very familiar to cross-platform applications using C#. Tools such as Xamarin and Visual Studio Code make C# a first-class citizen of application development on Windows, macOS, Android, iOS, and most Linux distributions.

What makes C# popular?

Here are three reasons why C# is so widely used:

Easy to learn because it is hosted

C# is a managed language, which means complex tasks such as memory management (for any application) and garbage collection will be handled for you. Existing hosting makes C# more approachable and easier to learn.

Excellent library for rapid development

The base class library, or BCL, is an extensive and commonly used function code library, developed, tested and provided by Microsoft for free. This resource within BCL allows you to focus on specific business issues rather than how to convert strings to uppercase or handle type conversions. When you use C# effectively, you will enjoy faster experience development schedules and simplified solutions.

Cloud Compatibility

All major cloud platforms support C# as the primary language and it is currently used in millions of cloud applications.

Why do I need to learn C#?

C# is a very mature and popular language. Here are a few reasons why you are worth your time to learn it:

Widely adopted and versatile

The 2020 Stack Overflow Developer Survey shows that 32.3% of professional developers use C#. You can use C# for any modern application, whether on mobile devices, microservice architecture, or the latest Rent-a-llama SaaS products.

Make your skills future-proof

Learning C# is an important step towards a future-oriented skill set. Master C#, you'll develop learning, games, consoles and native mobile apps for the latest machines, plus... just about anything else. There is even a C# version for quantum computing!

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