[QUESTION] what are riffs and licks?

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Been playing guitar for a few months now (no lessons or anything, I just try to learn tabs of songs I like for fun). I’ve been doing some reading and two terms I keep seeing come up are “riff” and “lick.” Can anyone explain what these are and what is the difference between the 2? Some songs I can hear play are “california dreaming” and “time bomb” by Hollywood undead, and “mummy dust” by ghost. Can anybody tell me if these songs use riffs, licks, or both?

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