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We've been running our C# programs
with the command dotnet run.

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So what is this dotnet exactly?

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.NET is a framework developed by Microsoft
with the intent to improve on earlier work

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by Sun Microsystems with Java and
its virtual machine.

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.NET is a platform that can run programs
written in various languages including C#,

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F#, and Visual Basic.

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C# is primarily an object-oriented
programming language and

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it's the most popular
language on the.net platform.

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F# is primarily a functional language.

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And Visual Basic is a more simplistic
language intended for beginning coders.

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Which is not to say Visual Basic is a more
appropriate choice for learning to code.

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You can definitely learn C# as
your first programming language.

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And since C# is much more popular,

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there's really no reason to bother with
Visual Basic if you don't want to.

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C#, F#, and Visual Basic all compiled
down to an intermediate language

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which is handled by the .NET
common language runtime or CLR.

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This intermediate language isn't intended
to be written or read by humans and

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it can't be executed directly
on a computer processor either.

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The CLR is responsible for compiling
the intermediate language into machine

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language which a computer
processor can run.

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This used to mean that your
users would have to download and

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install dotnet in order to
run your finished program.

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But now it's possible to create
a self contained deployment and

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executable that contains
the .NET runtime so

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it can run all by itself without
.net installed on the target system.

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Because self contained 10 deployments
include the .net runtime,

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they're a bit larger in size.

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So it's also still possible to create
a framework dependent deployment.

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These require your users to install
the .NET runtime separately, but

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they're also a bit smaller.

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So why go to all this trouble?

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The promise of .NET is the ability
to write code once and

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have it run on any
compatible operating system.

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.NET compatible implementations
are available for Windows, MacOS, Linux,

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and even iOS and Android.

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It's not quite as simple as being able to
write a single program and have it run on

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all these platforms, but you'll definitely
be able to reuse portions of your code.

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Hopefully this clears up some confusion.

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.NET is not the same as C# and

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it is not an alternative to C# because
it isn't a programming language.

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It's the framework that is used to run
code written in C# and other languages.