It is a platform allowing the developers ro create applications which can be operated with other platforms as well. Also known as .Net Framework, the platform promotes innovation for enterprise application development & deployment.
If you know this course of ASP .NET, it will help in reduction of the amount of the concept that gets required for developing large applications. Once you have this built-in MS Windows confirmation and configuration for every application, the applications become safe and effectively secured. Thus, it is always advisable to learn .NET language for the ease of usage of developing applications.