Is it similar to the waves on the surface of an ocean, where the particles go 2 steps forward and 1 step back in waves? If so, what makes it do that? Why would that be used instead of DC current?
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Alternating current arises from the rotational motion of a generator. You don’t need to permanently transport electrons to make electricity do work. They return to the source after they’ve gone through the load. AC is used because the voltage can be easily stepped up and down in a simple transformer using magnetic induction to balance power, loss and safety. Changing DC voltage is more a more complex task.
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