What is the difference between Class 2 and Class 3 ebikes?

Please see the example below for California Classification:

• Class 1: Bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to assist when the e-bike reaches 20 mph.
• Class 2: Bicycle equipped with a throttle-actuated motor, that ceases to assist when the e-bike reaches 20 mph.
• Class 3: Bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to assist when the e-bike reaches 28 mph.

Please click HERE for E-bike laws and classification (regarding helmets, age restrictions, etc.) for every state!