The U on iTunes - Terms
RTP (Real-Time Transport Protocol)
The Real-time Transport Protocol (or RTP) defines a standardized packet format for delivering audio and video over the Internet. RTP/RTCP protocols are commonly used to transport audio or audio/video data. For each media content (e.g. audio and video content) are used separated RTP/RTCP sessions. The main advantage of it is if a bandwidth is lower then it is needed it is possible to receive only one part - commonly audio data.