TDLS, shortened from Tunneled Direct Link Setup, is "a seamless way to stream media and other data faster between devices already on the same Wi-Fi network."
It describes this feature as technology that enables devices to link directly to one another when connected to a traditional Wi-Fi network.
Wi-Fi CERTIFIED TDLS devices can set up secure links and transfer data directly between them.
TDLS-linked devices benefit from an optimized connection to do things such as streaming video or synching content, without burdening the network as a whole.
[3] Google's Cast protocol used by Chromecast utilizes TDLS to initiate screen mirroring.