macOS is Unix at its heart, and Unix thrives on “ownership” and “permissions.” These are attributes attached to every file and folder that describe which users and groups have the right to perform what actions on them: read or view, modify, delete, or, in the case of folders, also see the contents, remove items, and add items.
IDG
Get Info lets you change permissions recursively for folders (every nested item) or for groups of items.
