First aid is immediate assistance given to someone who is injured or suddenly affected by an illness. It includes caring for life-threatening conditions and preventing further harm until professional medical help arrives. A first aid box contains supplies to treat common injuries and illnesses like bleeding, fractures, burns, and choking. It should include protective equipment like gloves, masks, and bandages as well as medications for pain, infection, and symptoms. Providing first aid safely requires taking precautions like wearing gloves and masks to avoid contact with blood or fluids and properly disposing of medical waste.