Official TWRP App is a handy piece of software that gives you the ability to stay up-to-date with the latest releases of your customized ROM. Each time a new version is available for your current ROM, this application offers the proper functions for downloading and installing this content directly on your Android tablet or smartphone. Please keep in mind that your device must be rooted in order to use this feature.
If you don't have the required privileges, you can still use this software to perform version checking. The user interface rocks a straightfoward design where you are required to select your device model and a file to flash. At this moment you can only use this application for flashing images found on your device's internal storage. In the future, the developer targets to allow users to flash images stored on other locations, as well.
As you can probably expect, if you don't know what exactly you're doing, then you should NOT use this application.