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Wireless Multimedia Extensions (WME), also known as Wi-Fi Multimedia (WMM) is a Wi-Fi Alliance interoperability certification, based on the IEEE 802.11e draft standard. It provides basic Quality of service (QoS) features to IEEE 802.11 networks. WMM prioritizes traffic according to four AC (Access Categories) - voice, video, best effort, and background. However, it does not provide guaranteed throughput. It is suitable for simple applications that require QoS, such as Voice over IP (VoIP) on Wi-Fi phones.

No acknowledgement, which is useful for real-time apps such as voice and streaming media, which can't afford to re-transmit packets because of lower latency and jitter tolerance. And the re-tried data will arrive too late and become meaningless anyway.

WMM Power Save is a set of features for Wi-Fi networks that help conserve battery power in small devices such as phones, PDAs, and audio players. The certification for both access points and client devices uses mechanisms from the recently ratified IEEE 802.11e standard, and is an enhancement of legacy 802.11 power save. WMM Power Save helps pave the way for rapid proliferation of Wi-Fi technology into devices dependent on battery power. With WMM Power Save, the same amount of data can be transmitted in a shorter time while allowing the Wi-Fi device to remain longer in a low-power "dozing" state. With improved sleep capabilities in the chip and the opportunity to fine-tune power consumption at the application layer, device manufacturers and developers now have a robust framework to improve Wi-Fi power efficiency.