While few companies build MMC slots into devices as of 2018 (SD cards are more common), the embedded MMC (eMMC) is still widely used in consumer electronics as a primary means of integrated storage in portable devices. Since the introduction of SD cards, few companies build MMC slots into their devices (an exception is some mobile devices like the Nokia 9300 communicator in 2004, where the smaller size of the MMC is a benefit), but the slightly thinner, pin-compatible MMCs can be used in almost any device that can use SD cards if the software/firmware on the device is capable. They are used in almost every context in which memory cards are used, like cellular phones, digital audio players, digital cameras and PDAs. MMCs are available in sizes up to and including 512 GB. Modern computers, both laptops and desktops, often have SD slots, which can additionally read MMCs if the operating system drivers can. Via an MMC reader (typically a small box that connects via USB or some other serial connection, although some can be found integrated into the computer itself), a user could transfer pictures taken with the digital camera to their computer.

For example, a digital camera would use an MMC for storing image files. Typically, an MMC operates as a storage medium for a portable device, in a form that can easily be removed for access by a PC. MMC can be used in many devices that can use Secure Digital (SD) cards. MMC originally used a 1- bit serial interface, but newer versions of the specification allow transfers of 4 or 8 bits at a time.

MMC is about the size of a postage stamp: 24 mm × 32 mm × 1.4 mm. Both products were initially introduced using SanDisk NOR-based flash technology. Unveiled in 1997 by SanDisk and Siemens, MMC is based on a surface-contact low pin-count serial interface using a single memory stack substrate assembly, and is therefore much smaller than earlier systems based on high pin-count parallel interfaces using traditional surface-mount assembly such as CompactFlash. The MultiMediaCard, officially abbreviated as MMC, is a memory card standard used for solid-state storage.

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