Samsung's DeX technology, which works a lot like Microsoft's Continuum feature for Windows phones, has been one of the notable features of the Korean company's flagships for some time now. Essentially, it lets connect your phone to an external display and some accessories to use it in a desktop-like environment, as you would a computer.
With the Galaxy Note10, Samsung and Microsoft announced a significant partnership with the Link to Windows feature, which relies on Microsoft's Your Phone app for Windows 10. But Samsung has even more plans when it comes to PC connectivity, as the company has now released a DeX app for Windows and Mac.
The app is available for Windows 7 and 10, though there's likely no reason it wouldn't work on Windows 8.1, and macOS 10.13 or higher. It also only works if you have one of the newly-announced Note10 smartphones, which is an unfortunate restriction if you have an older Galaxy device. The app will essentially let you use your PC to do what you would do with a separate screen, and since your PC already has a mouse and keyboard, you won't need a second set of accessories.
This feature may raise some questions, particularly as to why you wouldn't just use your PC's operating system to do work, but if you have data that's stored exclusively on your phone, there's still a use case for this app. You can download DeX for Windows here and for Mac here. You can learn more about the feature on Samsung's website.