A CPU is a part of the computer that interprets and executes information.
it executes the program ,performs the computations and controls the flow of the instructions.
Microprocessors. Nearly all of today's laptops and computers have a microprocessor being used as their CPU (central processing unit)
To do the actual additions and make the other necessary "decisions". The CPU is also know as the processor.
by volatile do yo mean which looses its content when powered off? If so, yes most of them. I've a seen they also sell wood/stone CPU, which are CPUs that are not powered at all.They can retain there...