The Digital Address (JPN ver only) is a service that can convert your home address (the home address registered to your Yu ID) into 7-digit alphanumeric code.
You can enter your home address automatically by using the Digital Address with functions such as the “Label creation” function on the Japan Post Official App (JPN ver only).
Note that the services using Digital Address are being gradually expanded.
<Related questions>
Q. Where can I use Digital Address (JPN ver only)?