Riddle: I am a window you can't see through, a key with no…

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i-have-a-memory-but-no-mind-a-key-but-no-lock-and-i-can

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though-i-have-no-eyes-i-can-see-all-i-fly-without-wings

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i-hold-the-power-of-thousands-but-weigh-just-a-few-my

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i-travel-the-world-yet-never-leave-the-ground-whisper

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i-exist-in-many-forms-yet-im-often-unseen-i-can-be-a