Uggg.... basically people like me use this software to write code and websites. Microsoft decided to make all their software tools work inside Visual Studio. The editor understands language syntax and can make programming languages easier to edit. It can highlight errors while you type, saving the developer time by not requiring builds all the time. It also uses templates and can instantly generate a pre-made application with source code. I'm not going to try and explain managed and native code. It would be very boring to you.