EEPROM stands for Electrically Erasable Programmable Read Only Memory.  It is also called E2PROM.  EEPROM is a type of Read Only Memory.  The data in an EEPROM can be erased by applying an electric charge to it.  

The data in an EEPROM needs to be erased one byte at a time.  In contrast, in Flash Memory, the data is erased and written in blocks which makes it faster.