Programmable read-only memory (PROM) is a term used to describe a type of computer memory that can be programmed or written to during manufacturing, but cannot be altered once it is in use. There are several synonyms for this term, including "erectable read-only memory" (EPROM), which is a type of PROM that can be erased and reprogrammed multiple times, and "electrically erasable programmable read-only memory" (EEPROM), which can be erased and reprogrammed electrically. Another synonym for PROM is "masked ROM", which is a type of memory that is programmed during manufacturing using a mask to create a specific configuration of memory cells. Additionally, "fuse PROM" (FPROM) is a type of PROM that uses a series of programmable fuses to store information.