If you have coax connected to the outside of your house...as opposed to the newer fiber...your Mini Box will connect to coax cable.
The outside coax will connect (drop) to a wall outlet inside your living room. If you subscribe to Internet and TV, you'll need 3 segments of coax cable for your living room.
1. You'll connect Coax-1 to the wall plate
2. On the other end of Coax-1, you'll connect a splitter
3. The splitter will have at least 2 outputs
4. You'll connect Coax-2 to one of the outputs and to your Internet modem (DOCSIS)
5. You'll connect Coax-3 to the other output and to your Mini Box
If you have 4 cable boxes in other rooms, each box will connect to the coax drop in each room.
Your house has only 1 coax connected to it. Somewhere between that outside connection and your living room, there's a splitter to divide the signal for each room (drops). That splitter is probably behind the wall outlet in your living room. If you remove its cover plate, there's probably a 4-output splitter behind it. That splitter connects all rooms to that outside connection.