so that
final: Zweck, Absicht
Purpose, intention
☞ The main difference from "um zu" — DIFFERENT subjects in the two clauses. "Ich lerne, damit ich Deutsch verstehe" — also works with "um zu". "Ich lerne, damit meine Mutter stolz ist" — must be "damit" because the subjects differ.
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Ich gebe dir das Geld, damit du das Buch kaufst.— I'm giving you the money so you can buy the book.