What is Sandbox in iOS? Can I transfer data between one app to another app?

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From The iOS Environment

For security reasons, iOS places each app (including its preferences
and data) in a sandbox at install time. A sandbox is a set of
fine-grained controls that limit the app’s access to files,
preferences, network resources, hardware, and so on. As part of the
sandboxing process, the system installs each app in its own sandbox
directory, which acts as the home for the app and its data.

one solution to transmit data from one to another app is via URL Schemes

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