In spy movies they ask, if one is on a secure line? What is that? Can Theoretically any communication channel could be eavesdropped?
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It means the channel is encrypted.
The people on each end of the line have a unique ‘key.’ This key is secret and you can’t share it with anyone. Before the message is sent across the line, it is scrambled into gibberish and the only way to unscramble it is by using the key either you or the other person have.
So hypothetically, if someone intercepted the message, all it would be is a big pile of gibberish and they have no way of knowing what it actually says without the key to ‘unlock’ it.
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