How Do Use 1 Ethernet Connection For Multiple Computers? | All About Money Online

I am trying to turn one Ethernet connection into multiple connections for 5 computers. I know there’s a small box thing that I can plug them in to (my uncle had one), but I don’t remember what it’s called and how to go about getting started with it. Could someone please help, ASAP. I need to know what I need. THANKS!

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