Idiot question about extending wifi

[Steviesam]

Hi all.

Sorry for what is an idiot question!

I have a router in my lounge, and I want to drill a hole in the wall to the room next door and run a cable from the ethernet socket of the router to a new unit that will provide wifi to the room next door.

I dont want a wireless extender, I want one that plugs directly via cable into my router.

What are they called? Everything I google comes back as a wireless booster, but I want a cabled one.

Thanks

[Steviesam]

Perfect, thank you