Monday 15 October is Global Handwashing Day.
Handwashing with soap is the most effective and inexpensive way to prevent diarrhoea and other infectious illnesses that kill millions of children in developing countries every year.
Making handwashing with soap before eating and after using the toilet a habit could save more lives than any single vaccine or medical intervention.
These photos show children from all over the world learning about the importance of handwashing.
In Peru, a caregiver helps a girl wash her hands with soap in a early childhood development centre, in Ventanilla, outside the capital Lima.
© UNICEF/NYHQ2010-2088/Susan Markisz