Global Handwashing Day is an annual global event celebrated in over 100 countries to promote handwashing with soap as a key behavior that can prevent diseases like pneumonia and diarrhea. The event now reaches over 1 billion people across more than 1,000,000 schools and is growing each year, helping to drive long-term policy and investment changes around handwashing. Proper handwashing is one of the most effective ways to prevent the spread of many infectious illnesses that claim many lives worldwide, especially for children under five.