The main difference between EPROM and EEPROM is that, the content of EPROM is erased by using UV rays. On the other hand, the content of EEPROM is erased by using electric signals.
Short for Electrically Erasable Programmable Read-Only Memory, EEPROM is a PROM that can be erased and reprogrammed using an electrical charge. EEPROM was developed by George Perlegos while at Intel in 1978, and unlike most memory inside a computer, it remembers its data without power.