The MacBook has one USB-C port, has a smaller 12" screen, and is lighter (2 lbs).
The MacBook Air has two Thunderbolt 3 (USB-C) ports, has a 13" screen, is heavier (2.75 lbs), and has more CPU power than the MacBook.
The MBP w/o touch bar has two Thunderbolt (USB-C) ports, a 13" screen, is heavier (3 lbs), and more CPU power than the Air
The MBP w/ touch bar has four Thunderbolt (USB-C) ports, a 13" screen and has more CPU power (options) than the MBP w/o touch bar (same weight).
(I intentionally left out the 15" MBP)