what is a 'non-volatile memory device'?

Question

this is made of ferroelectric materials

Answer 1

Non - volatile means that which is not easily lost
so NVM Devices are those devices that have the ability to retain their memory
u see it is based on hysterisis loss or the past history
if u study the hysterisis curve of ferroelectric materials u can understand about it.
They have the ability to retain their magnetic domains to a greater extend and hence the 0's and 1's they store is not lost so easily.

hope this helps

Answer 2

Non-volatile memory, nonvolatile memory, NVM or non-volatile storage, is computer memory that can retain the stored information even when not powered. Such as the programmable ROM (PROM) on a computer's motherboard.

Answer 3

I agree with the above....

Some good examples of NVM are-:

i) Computer USB Memory Stick
ii) Computer Hard Drive
iii) ROM or PROM Chips (Programmable Read Only Memory)