Static content
A static code stores your URL, contact details or text. The printed modules stay the same and there is no management account involved. Valid QR Scan creates static codes.
Hosted redirects
A dynamic code generally stores a service URL that redirects to a managed destination. Changing that mapping requires a backend, persistent storage and controls to prevent abuse. It can introduce availability, tracking and privacy dependencies.
Choose a stable address
If you control a web address, a static code can link to a page whose contents you update. This changes what visitors see, not the data stored in the code. Never assume a printed code is editable by itself.