祝福 (zhù fú) means 'to wish someone well' or 'to bless', often used for heartfelt wishes on occasions like festivals, weddings, or recovery. Compared to 祝 (zhù, HSK4), which is common in fixed phrases like '祝你……', 祝福 is fuller and more sincere. 祝愿 (zhù yuàn, HSK6) is more formal and literary, while 祝福 is the everyday verb for expressing good wishes.