What is AIFS (Arbitration interframe space)?

Arbitration inter-frame spacing (AIFS) is a technique of focusing one Access Category (AC) over the other in wireless LAN communications, for example, providing voice or video priority over email. AIFS capacities by reducing or expanding the period a wireless node has to wait before it is permitted to send its next frame. A shorter AIFS period implies a message has a higher likelihood of being communicated with low latency, which is especially significant for delay-critical information like streaming video.