What piece of networking equipment do I need?

[Beano]

I believe what your trying to say is, you have multiple computers in your room, but only one Ethernet plug? You want to get a router. I have one in my room for this purpose.

EDIT: I have this one

If I plug the 4 computers in my room into this router, will it allow them to connect wirelessly to my router downstairs?

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I think you need a wireless router I don't see what the problem is?

The problem is, I have 3 computers in my room without internet access which is seriously restricting my work.