what are the techniques used to measure the semilarity between two signals or more in time or frequency domain?

what are the techniques used to measure the similarity between two signals or more in time or frequency domain? i have two signals, want to test the similarity or compare between them to find how they are related to each other. and i want to know what is the difference when it is measured in time domain or in frequency domain?

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on 8 Jan 2015

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on 20 Aug 2021

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