This document discusses real-time multimedia traffic over the internet. It provides examples of real-time traffic like a video conference versus non-real-time traffic like downloading a pre-recorded video. It describes the key characteristics of real-time traffic, including jitter caused by packet delay and the need for timestamps and playback buffers to prevent jitter. It also discusses how protocols like RTP and RTCP are used to transport real-time multimedia traffic over UDP to make up for UDP's deficiencies for real-time applications.