Multimedia over Coax (also called MoCA) is a technology that sends internet or multimedia data through the same coaxial cables normally used for TV signals.
This is useful in homes where Wi-Fi is weak or walls block signals, because it turns existing TV cables into a high-speed wired network.
For example, instead of drilling new holes or running long Ethernet cables, you can use your DSTv coaxial wiring to deliver internet to your Smart TV.
See also: Ethernet, Wi-Fi, Smart TV Connectivity.