Microsoft Visual Studio LightSwitch is a tool that allows developers to quickly create applications for the web, desktop, and mobile devices. The main advantage of using LightSwitch is its simplicity; it can be used to create applications without having to write any code. This makes it an ideal choice for businesses or individuals who want to create applications without investing a lot of time or money into learning how to code. Another advantage of LightSwitch is its flexibility; it can be used to create both traditional Windows-based applications and modern web-based applications.