With UWP app PACKAGES, you cannot simply install an app to your device like DESKTOP APPS. TYPICALLY, you download these apps from the Store and that is how they are INSTALLED on your device. But you can sideload apps to your device without submitting them to the Store. This lets you install them and test them out using the app package (.appx) that you have created. If you have an app that you don’t want to sell in the Store, like a line-of-business (LOB) app, you can sideload that app so that other users in your company can use it.

With UWP app packages, you cannot simply install an app to your device like Desktop apps. Typically, you download these apps from the Store and that is how they are installed on your device. But you can sideload apps to your device without submitting them to the Store. This lets you install them and test them out using the app package (.appx) that you have created. If you have an app that you don’t want to sell in the Store, like a line-of-business (LOB) app, you can sideload that app so that other users in your company can use it.