A portable monitor is a slim, lightweight secondary display that connects to a laptop, phone, or console via USB-C or HDMI to give you extra screen space anywhere. Unlike a regular monitor, it’s designed for travel—usually 13 to 17 inches, powered over USB, and often with a built-in stand or folio case. It’s used by remote workers, gamers, and creators who need dual screens for multitasking, editing, or presentations without being tied to a desk setup. Most models are plug-and-play and draw power directly from the device, making them fast to set up on the go.