Does anyone know if there is such a thing as an ethernet cable splitter?

What i need it to turn one outgoing line in to 2 while im networking the office today and i know other cables have these available but ive never had the need for one of these splitters before.

Basically i *think* im looking for some kind of adaptor to plug the ethernet cable into which then has two output lines coming out of it.

Does that make sense?

Regards,

Lee