I am not getting what .NET is actually and what it does?

[shivajikobardan]

As you can see we are not learning the real programming but high level overview of what .NET does. The textbook that I have (which isn't a official textbook but a solution manual forced to buy by teachers)

It is pretty confusing. What are the things that it does?
The only time I have encountered .NET is while trying to run applications, it asks for "download .NET".

Some are saying C# uses dotnet and sth. It is just confusing me. Some saying it is like java, in what sense? And there is .NET framework, .NET platform. One thing that I have somehow managed to enter my mind is that it helps to make applications for mobile, web, desktop and anything you want. (Not sure how it does by just 1 .NET.)

The below are the slides given by our professor

 

[I like Serena]

C# is a language similar to java.
.NET is a set of libraries similar to the libraries that are provided or can be downloaded when developing with java.