Can You Split One Ethernet Cable Into Two

It splits the 4 pairs of wires inside a network cable to share a cable for 2 devices.
Can you split one ethernet cable into two. But then you start looking into ethernet solutions and realise you have the choice between a hub splitter and switch. Plug play installation to an rj45 wall plate or female coupler at each end of an ethernet cable. One office one ethernet jack and two computers or one living room one ethernet jack and one htpc and one xbox. Is it possible to have one cat5 4 twisted pairs cable and split it into two ethernet ports.
The cable matters rj45 ethernet cable sharing splitter kit connects two network devices over a single network cable to two ports on an ethernet router or switch. With an ethernet splitter you can simultaneously connect two computers or other network devices on one ethernet cable. Superuser reader ravenix wants to know if it is possible to run two ethernet connections over the same cable. You can buy ethernet splitters for approximately 20 00 usd but you also can make your own.