Microsoft Visual Studio is our primary IDE for application development. First released in 1995 it has always remained the best development tool out there. Visual Studio is one of the big reasons why building large-scale enterprise applications using .Net is easier than with other platforms.
Functionally this product encompasses not only programmer's profession, but also jobs of testers, business analysts, project managers and others.
Visual Studio is not just a commercial product for sale. Microsoft develops its own products in this IDE. There is also a free Express (Community) version and a separate light-weight editor Visual Studio Code (also free). Code supports not just Microsoft's technologies, but other popular languages and platforms.