1.ROM
2.PROM
3.EPROM
4.EEPROM
5.Flash memory
It is nonvolitile and unchangeable
RAM is Serial Acces Memory

Cache memory comes in L1, L2, and L3 Cache
but there are a veriety of forms even virtual memory is cache

Virtual memory has a very big benefit to a user for a low cost
it is a type of Cache that is a part of most operating systems
