Over a billion people volunteer their time, skills, and experience to help improve their communities. From providing practical support to vulnerable children and adults to advising on sophisticated technical and legal issues, volunteers are present at all levels of society. Each one brings a specific set of skills to their tasks.

To mark this occasion, UN Deputy Secretary-General Amina Mohammed sends a message of thanks to volunteers, who, she says, "bring concrete solutions to development challenges and for the common good."