What is the name of the PlayStation 3's user interface?

The PlayStation 3’s user interface was called the XrossMediaBar, commonly abbreviated XMB.

The XMB was designed by Sony Computer Entertainment as a menu system organized around a horizontal row of categories. Selecting a category revealed related options vertically, allowing users to navigate with the controller’s directional pad rather than moving a traditional pointer. The layout made settings, games, media, network tools, and user profiles accessible from one consistent screen.

On the PlayStation 3, the interface included areas such as Users, Settings, Photo, Music, Video, Game, Network, PlayStation Network, and Friends. It also supported features that helped the PS3 function as a broader entertainment hub, including photo browsing, music playback, video management, web access, and online communication.

The XMB was not exclusive to the PS3. It was also used on the PlayStation Portable, the PSX digital-video-recorder system, Sony BRAVIA televisions, Blu-ray players, and other Sony products. LiveArea was the PlayStation Vita interface, while PlayStation Home was a separate social platform. The name XrossMediaBar refers to the interface itself, not to a particular online service.