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C#s IO Is Built Upon Streams

C# programs perform I/O through streams. A stream is linked to a physical device by the C# I/O system. The I/O classes and methods can be applied to many types of devices. At the lowest level, all C# I/O systems operate on bytes. The Predefined Streams Console.Out: the standard output stream. Console.In: standard input, which is by default the keyboard. Console.Error: the standard error stream, which is also the console by default.