AVB is short for Audio Video Bridging. AVB is part of the Ethernet and Wi-Fi standards (IEEE 802).
AVB technology is comprised of multiple standards within the IEEE, namely 802.1AS, 802.1Qav, 802.1Qat. An overview specification and guideline for implementation in 802.1BA which you can obtain here. There are AVB-related specifications added to 802.11av for wireless support, and 802.3 for timestamping on wired links. The AVnu Alliance has published a general overview of the technology. Ongoing enhancements to the AVB standards are managed by the Time-Sensitive Networking Task Group.
The list of manufacturers and developers supporting AVB is growing every month. Current Apple iMacs, MacBook Pros, MacBook Airs and Mac Pros all support AVB. The AVnu Alliance is an AVB industry alliance consisting of major companies in consumer electronics, professional audio and automotive manufacturing. To see a list of AVnu members see the AVnu members page.
The three main markets for AVB are consumer electronics, professional audio and automotive electronics.