Initially released on December 12, 2004, PSP (PlayStation Portable) is a brand of portable, handheld video game consoles sold by Sony. PSP devices are composed of a small LED screen with controls on both sides. The button layout closely resembles a DualShock controller, which is sold with other PlayStation consoles. Physical games for the PSP were sold in a proprietary format called UMD (Universal Media Disc). They could also be purchased digitally through the PlayStation Store.