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In the Solidity docs section on memory, you find this paragraph (emphasis added):

Each account has a data area called storage, which is persistent between function calls and transactions. Storage is a key-value store that maps 256-bit words to 256-bit words. It is not possible to enumerate storage from within a contract and it is comparatively costly to read, and even more to modify storage. A contract can neither read nor write to any storage apart from its own.

What is meant by the part in bold?

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  • It means that a contract cannot access state-variables of other contracts.
    – goodvibration
    Commented Jun 30, 2019 at 11:26

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The storage is as mentioned in the doc a key-value store/database. So enumerating the storage is the ability to access each key-value (one by one) which is impossible to do from a contract.

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