U may need to be more specific
If ur asking what their using them for in the assembly line, It's to build cars faster and cheeper. Human labour is very expensive. I don't like it, but that's true.
Car industries use robots, If that's what you mean. If not Google.com :)
Robots don't use bathrooms
Exploratory robots use motion, heat, and camera sensors.
No robots cant use the bathroom they simply have no Bladder so they cant ever have to go
Robots that self operate are known as automaton robots.
no
Yes in some industries. Car makers use robots.
The vast majority of robots use no AI. In general AI in robots is still limited to mostly robotics research.
Robots and people
yes
Robots are cool. There I used it in a sentence, even though I don't think robots are cool.
humans use water balloons and salty snacks to battle evil robots in slow motion. The humans always lose.