It's called spacedesk, and with it, I was able to quickly and easily use my tablet or my smartphone as a second monitor for my PC.

Expand your one small screen to two 4K big displays with this compact adapter that works across Mac, PC, and compatible tablets and smartphones.

The Galaxy Tab S11 series upgrades Samsung DeX with the ability to use the tablet screen as a second DeX monitor, giving ...

If you have an old Android tablet, or a new foldable phone, why not turn it into a portable monitor? Here's how I've done it.

But an extra computer monitor isn’t something you can just throw in your bag when you’re on the go. Or can you? MORE: How well do new smartphones withstand everyday wear and tear?