The Steam Deck is a handheld gaming device developed by Valve Corporation. It allows users to play a wide range of PC games from the Steam platform on the go. The device features a custom AMD APU, a 7-inch touchscreen display, and a variety of control options, including thumbsticks, trackpads, and buttons. With its portable design, the Steam Deck aims to provide a console-like gaming experience in a compact form. It runs a Linux-based operating system called SteamOS, which can also be replaced with other operating systems, giving users flexibility in how they use the device.