Psalm 21 is a song of praise and thanksgiving for victory. King David rejoices in the strength and salvation of the Lord, recognizing that every success, blessing, and crown he has comes from God. The psalm celebrates how God answers prayer, grants life, and secures victory. It also prophesies that God will judge and defeat His enemies with righteous power. The chapter ends with a call to exalt God’s strength and sing His praise, because He alone is worthy and sovereign over all.