Flashing a ROM means installing the system image into the device's internal flash memory. Flash memory holds the Android's firmware, the same as most portable devices with an embedded OS.
They conform to a variety of quality standards. MASK ROM chip manufacturers are less numerous than producers of PROM chips, EPROM chips, EEPROM chips, NVRAM chips, and Flash memory chips. The reason ...
Another term for flash memory. Since flash chips can be updated over and over, the ROM (read only) designation is somewhat misleading. "ROM" is used more to mean not volatile than not changeable.