What is .NET and C#?

In simple terms,  .net is framework and c# is one of the language. 

In real world,  rules and guidelines are framework,  how you approach is similar as c#...

https://stackoverflow.com/questions/2724864/what-is-the-difference-between-c-sharp-and-net#:~:text=C%23%20is%20a%20programming%20language.,build%20applications%20using%20that%20framework.

https://www.tutorialspoint.com/difference-between-chash-and-net

C# is a programming language, .NET is a blanket term that tends to cover both the .NET Framework (an application framework library) and the Common Language Runtime which is the runtime in which .NET assemblies are run.

Please refer below url for more details

 https://www.google.com/amp/s/learn.nashvillesoftwareschool.com/blog/2091/07/18/the-difference-between-c-and-.net-through-the-lens-of-javascript%3fhs_amp=true

https://askanydifference.com/difference-between-net-and-c-with-table/

Hello Kevin,

.NET is a free, cross-platform, open source developer platform for building many different types of applications.

With .NET, you can use multiple languages, editors, and libraries to build for web, mobile, desktop, games, IoT, and more.

Please read below article written very well,

https://www.c-sharpcorner.com/article/what-is-net/ 

C# is crossplatform programming language,C# (pronounced "See Sharp") is a modern, object-oriented, and type-safe programming language. C# enables developers to build many types of secure and robust applications that run in . NET. C# has its roots in the C family of languages and will be immediately familiar to C, C++, Java, and JavaScript programmers

https://www.c-sharpcorner.com/article/what-is-c-sharp/