What's an eeprom i don't think there is such a thing have heard of an eprom?
Yep, they're real.
The original rom's that were invented years ago were programmable once and then that was it, you couldn't change the data in them, it was fixed. To change the data you had to change the rom ic. A rom is a read-only memory device, you can't write to it (except during a one-time programming which is a special event). Read-only memory=ROM.
A prom is a general term for any non-volatile memory that can be programmed, so a rom, an eprom and an eeprom are all prom's.
An eprom is a memory device (ic) that can have its data erased by exposing the chip to UV light for about 25 minutes, give or take depending on the strength of the UV lamp. That's why there is a clear glass window on top of the chip. They are usually installed into sockets so you can remove them, erase them, reprogram them and then reinstall back into the board. eprom = "erasable programmable rom"
An eeprom is a newer variation of the memory device that allows the data to be erased by applying an electrical signal or voltage to a special pin. So an eeprom is an "electrically erasable programmable rom". This is much quicker to do an erase and can be done without removing the eeprom from the board if the board is designed right. Also, with many modern eeproms you can selectively erase portions of it, you don't have to erase the entire thing.
Things in technology evolve frequently.