Some projectors use a connection technology called that enables long-range connectivity for uncompressed hd video and audio over cat 5a or cat 6 network cables.

HDbaseT

Explanation:

HDbaseT is  a global connectivity standard for transmitting uncompressed high definition videos, audios, power, usb, ethernet home networking and some control signals for up to 100 meters, over a category cable like Cat 5a or Cat 6 cables.

The projector uses the HDbaseT for these reasons and for the fact that it eliminates clusters in cables without affecting its performance or high quality. This gives a high quality output display from the projector.

(http) hyper text transfer protocol

which means its an input that allows the "site" to connect with severs.