The Touch Bar is a feature that adds touch-based controls to Mac apps and system controls. It is an OLED panel that replaced the physical Function keys on a MacBook Pro. The Touch Bar was first introduced in the fourth-generation 13-inch MacBook Pro and 15-inch MacBook Pro in 2016. The 13-inch MacBook Pro with M2 is the only MacBook that currently has the Touch Bar. The 14-inch MacBook Pro, 16-inch MacBook Pro, and 13-inch MacBook Air do not have the Touch Bar.