a. How do crawler type cars turn?
b. How does movement transfer between gear and worm?
c. What is bluetooth technology?
d. What is Wi-Fi technology?
e. Battery Method.
f. Auto video recording.
We are familliar with Robot.
Droid is also a Robot. This word is usually used in science comics and fictions.
In Camellia Café, Robot means industry or housework machine and Droid means human looked like robot.
All have Artificial Intelligence. Artificial Intelligence and Deep Learning are hot topics now.