Use the Touch Bar
If your Mac has a Touch Bar, you can use familiar gestures—like tap, swipe, or slide—directly on the Touch Bar to adjust settings, use Siri, access function keys, and do tasks in different apps.
The Touch Bar includes Touch ID, which lets you unlock your Mac and some password-protected items, use Apple Pay to make purchases on the web, and make purchases from the iTunes Store, App Store, and iBooks Store. To learn how to set up Touch ID, see Use Touch ID on your Mac.
Touch Bar basics
The Control Strip, at the right end of the Touch Bar, lets you adjust common settings—like brightness and volume—and ask Siri. You can expand it to access additional settings and features. The other buttons available in the Touch Bar depend on the app you’re using or the task you’re doing.
Change the brightness or volume, or ask Siri: Tap the buttons in the Control Strip. For brightness and volume, you can also quickly flick left or right on the buttons.