WiFi Multimedia - WMM (also known as WiFi Multimedia Extension - WME) - improves quality of service on a network by prioritizing data by four configurable categories:

Voice: Voice packets for Voice over IP (VoIP) calls.

Video: Video packets for support of TV streams.

Best effort: Support for legacy devices or devices lacking QoS standards.

Background: File downloads, print jobs and other traffic that does not suffer from increased latency.

WMM does not provide guaranteed throughput.