Hi yes you will need a router, plus you will need either a network card or a usb adapter for each computer.
There are loads of different ones around - personally i use belkin products the attraction being that therir helpline is 24/7 and is free.
The Evil Within 2 review-in-progress
InVision Studio takes on Adobe XD and Sketch
iPhone X news: Release date, price, new features & specs
Comment transformer un iPhone en borne Wi-Fi ?