what is the full form of PROM, EPROM and EEPROM

Here are the full forms and a brief description of each memory type:

• PROM: Programmable Read-Only Memory – A type of non-volatile memory chip that can be programmed once after manufacturing, after which the data becomes permanent and cannot be changed.
• EPROM: Erasable Programmable Read-Only Memory – A non-volatile memory chip that retains data even when power is off and can be erased (using ultraviolet light) and reprogrammed multiple times.
• EEPROM: Electrically Erasable Programmable Read-Only Memory – A non-volatile memory that can be electrically erased and reprogrammed, allowing for easier and more frequent updates without removing the chip from the device.

These memory types are all variants of read-only memory (ROM) used in computers and electronic devices for storing firmware, configuration data, and other critical information that must persist even when the device is powered off.