MMC
MMC may refer to any of the following:
1. Short for MultiMediaCard, MMC is a memory card available as flash memory and ROM used in car radios, cell phones, digital cameras, PDAs, MP3 players, and printers. Today, there are various variations and sizes of the MMC card such as the MMCP (MMCplus) and MMCM (MMCmobile / MMCmicro). The picture shows an example of a Kingston MMCM 1 GB card.
2. Short for Microsoft Management Console, MMC is a program included with Windows 2000 and above that enables administrators a central location to manage and control Windows tasks. If you have administrative rights, you can access this portion of Windows by clicking Start, Run, and typing mmc and pressing Enter.
ROM
Short for read-only memory, ROM is a storage medium that is used with computers and other electronic devices. As the name indicates, data stored in ROM may only be read. It is either modified with extreme difficulty or not at all. ROM is mostly used for firmware updates. A simple example of ROM is the cartridge used with video game consoles, which allows one system to run multiple games. Another example of ROM is EEPROM, which is a programmable ROM used for the computer BIOS, as shown in the picture below.
For the computer, the main EEPROM and BIOS is on the computer motherboard.