Explanation:

World First Aid Day is observed on the second Saturday of September annually. So, this year the day was celebrated on 11 September across the globe. The special day is marked to encourage people in first aid training which helps in preventing injuries and saving lives in critical situations. The theme for World First Aid Day 2021 is ‘First aid and road safety,’ according to the International Federation of Red Cross and Red Crescent Societies (IFRC).