Short for Multimedia Message Service.
Abbreviated as MMS, Multimedia Message Service is a store-and-forward method of transmitting graphics, video clips, sound files and short text messages over wireless networks using the WAP protocol. Carriers deploy special servers, dubbed MMS Centers (MMSCs) to implement the offerings on their systems. MMS also supports e-mail addressing, so the device can send e-mails directly to an e-mail address. The most common use of MMS is for communication between mobile phones.
MMS messages are delivered in a fashion almost identical to SMS, but any multimedia content is first encoded and inserted into a text message in a fashion similar to sending a MIME e-mail. MMS defines a subset of MIME content formats in the MMS Message Encapsulation specification. The message is then forwarded to the carrier's SMS store and forward server, the "MMS relay". If the receiver is on another carrier, the relay forwards the message to the recipient's carrier using the Internet. Once it reaches the correct MMS relay for the receiver, the content is extracted and sent to a temporary storage server (often the same process as the relay) with an HTTP front-end.
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