They serve as both storage and RAM in remote sensors and similar devices but not as the main memory in computers, phones and tablets because they are more costly (see non-volatile memory).

read-only memory (ROM) random access memory (RAM) close RAMRandom access memory. This is volatile memory that is constantly being written to and read from. It does not retain its contents without ...

Non-volatile memories are not the main memory (RAM) in computers, tablets and smartphones. When only a small amount of RAM is required, non-volatile memories can actually be the main memory in ...