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And the cultural disparities, different societies on Earth have various ways to communicate. Aliens could therefore be incomprehensible to us. Ways aliens that could communicate with us, if you want to consider that maybe they were already trying. Electromagnetic waves and utilizing them, SETI, for instance, focuses on looking for radio signals. alien technology could extend this beyond what's currently monitored. Radio waves study focuses on these, but they're not the only way to communicate. There's optical, like lasers and other light methods to be used by some advanced civilizations. Gravitational waves, theoretically it's possible to send messages by this mode. No one knows for certain yet. Biological signals, just wrapping.