The Virtual Gamepad Emulation Bus (ViGEmBus) is a Windows driver that emulates gamepad or joystick devices for software or games that require controller input. It is often used by developers, enthusiasts, and gamers who want to emulate gamepads for various purposes such as:

• Creating virtual gamepad controllers for use in software that doesn't support traditional gamepads.
• Enabling gamepad support for applications that only accept physical controllers.
• Enabling the use of custom controllers or mods that can emulate standard controllers like Xbox or PlayStation controllers.
• Developing and testing gamepad-based applications.