The Flash EEPROM or Flash Memory as it is popularly known is a type of Electrically Erasable Programmable Read Only Memory.  It is different from conventional EEPROMs in that the memory can be erased quickly, in a "flash".  Hence its name.  Flash EEPROMs are widely used in computers, in electronic devices such as cameras, cellphones and camcorders.

Flash EEPROMs are continually being made in smaller sizes.  Pen Drives are an example of Flash EEPROMs