EEPROM, the full name is Electrically Erasable Programmable Read-only memory, is a memory chip that does not lose data after power failure. EEPROM is a read-only memory that the user can change, and it can be erased and reprogrammed by a higher voltage than usual. EEPROM is generally used for plug-and-play, commonly used in interface cards to store hardware setting data, and commonly used in "hardware locks" to prevent illegal copying of software. The erasure of EEPROM does not need to resort to other equipment. It uses electronic signals to modify its content and uses Byte as the minimum modification unit. It does not need to wash all the data to write, eliminating the EPROM Eraser and programmer. Bondage. EEPROM still needs to use a particular programming voltage when writing data. The content can be easily rewritten with the dedicated refresh program provided by the manufacturer. Therefore, it is a dual-voltage chip.