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We all are well aware of Read-Only Memory, abbreviated as ROM, which is actually a memory chip used to store data permanently and retains it even when the system is turned off. In this article, we will take a look at the two modified versions of ROM – EPROM and EEPROM. ROM is a type of non-volatile memory and the data once written on it cannot be erased, but the advanced versions of ROM – EPROM and EEPROM resolved this issue and allowed erasability and reprogramming of data. EPROM stands for Erasable Programmable Read-Only Memory. As its name suggests, the data written on an EPROM can be erased and reprogrammed. A strong light source of ultraviolet radiation, such as a Mercury-vapour lamp is used and the light emitted by it is concentrated on the EPROM chip to erase the data stored in it. Later on, after the data has been erased, it can be reprogrammed to store specific data. While EEPROM stands for Electrically Erasable Programmable Read-Only Memory. Its working is similar to t