What was the first Mac to feature a Touch Bar?

The first Mac to feature a Touch Bar was the 2016 MacBook Pro.

Apple unveiled Touch Bar-equipped 13-inch and 15-inch MacBook Pro models on October 27, 2016. The Touch Bar was a narrow, multitouch OLED strip positioned above the keyboard, replacing the traditional row of function keys. It displayed controls that could change depending on the application in use.

The 2016 models also introduced Touch ID integrated into the power button, USB-C ports with Thunderbolt 3, and a thinner design. However, Apple also sold a lower-priced 13-inch MacBook Pro from that generation without a Touch Bar, so the answer refers to the Touch Bar-equipped 2016 MacBook Pro models specifically.

The Touch Bar was often confused with a touchscreen because it accepted touch input, but it was not a full display covering the Mac's screen. Apple gradually moved away from the feature, and later MacBook Pro generations returned to physical function keys.