The PlayStation Portable is a seventh-generation handheld console developed and marketed by Sony Computer Entertainment and it was first released in December 12, 2004 as a first handheld installment in the PlayStation line of consoles. The system was the most powerful portable console when it was introduced, its advanced graphics capabilities made it a popular mobile entertainment device which could connect to the PlayStation 2 and PlayStation 3 consoles, computers running Microsoft Windows and Apple Macintosh software, other PSP systems, and the Internet. The PSP is the only handheld console to use an optical disc format, Universal Media Disc (UMD), as its primary storage medium.