DbApp is an Android app developed by Giunti Editore, available for free in the Education & Reference category. The app allows quick access to extra content related to your book, which can be consulted on your smartphone or tablet.

Using the app is simple: you just need to locate the pages with the QR Code, press the scan button, and scan the code. Once scanned, you can access the extra content, which includes videos, audio, and interactive objects. This feature is especially useful for students and professionals who need to consult additional content related to their books.

Overall, DbApp is a useful tool for those who want quick access to extra content related to their books. The app is easy to use and provides a variety of content types to choose from. However, it is worth noting that the app requires a stable internet connection to access the extra content.