Difference between moderation and mediation

What is the big difference between moderation and mediation?

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Both moderator and mediator have influence over other effects or relationships, but the mediator also explains a relationship.
Both moderator and mediator have influence over other effects or relationships, but the moderator also explains a relationship.
A mediator has influence over other effects or relationships, whereas the moderator explains a relationship.
A moderator has influence over other effects or relationships, whereas the mediator explains a relationship.