Sidecar in macOS turns your iPad into a second display, but it's limited to certain Macs and iPads. Thankfully, a few ...

spacedesk is a free app that lets you use an Android tablet as a second display for your Windows PC. Learn how to set up and use it.

We show you how to configure your Samsung phone or tablet to run like a desktop PC on your monitor or TV, complete with a mouse and keyboard.

A standard monitor doesn't have a lot of use once you turn off your computer, but a smart monitor can let you use several features on just the monitor.