Best network switch for connecting multiple PCs?

I’m certainly no IT specialist, so I’m coming to you all for some guidance and perhaps a solid recommendation.
At my office, we have three computers currently networked together—they're all hardwired into the LAN ports of our Motorola Razr router. This setup gives everyone steady internet access and allows the machines to talk to one another without any hiccups. However, we now need to add a fourth workstation to the mix. The catch is that I don't have an available port left on the router, and this new computer needs to be physically located right next to one of the existing setups. My thought was to grab a network switch—essentially plugging the main line from the router into the switch, and then running two separate cables from the switch to the two computers sitting there. That should theoretically get the fourth machine online and fully integrated into our local network, right?
If a network switch is indeed the way to go, I’d love some specific model suggestions. To be honest, I care much more about reliability and uptime than I do about finding the cheapest option on the shelf.
Thanks in advance to anyone who can offer some helpful advice or a practical solution!

You could probably use something like this:

There aren't even separate inputs and outputs—it’s all just the same ports. You basically just plug the cables in and you're done.

Thanks so much for getting back to me with that recommendation—I have to say, I’ve consistently found nothing but top-tier advice on this forum since I joined!