Apple's multitouch toolbar introduced on its 2016 line of MacBook Pro laptops. The Touch Bar was a unique addition to Apple's laptop line that allows applications to offer touch access to their most important functions. The Touch Bar lies on the same horizontal plane as the keyboard.
No More Touch Bar in 2021
MacBook Pro models with the M1 Pro and M1 Max processors dropped the Touch Bar and went back to regular function keys. See MacBook Pro
and good user interface
The Touch Bar
Very innovative, any Mac application can be made to display essential functions for the currently running process. Applications can change the touch keys for different modes the user might select. In addition, although the physical F1-F12 keys are not standard, they can be simulated, and in some apps, users can configure their own keys. (Images courtesy of Apple Inc.)