Many people may take their birth certificate, or similar official papers, for granted - hidden in a drawer and rarely seeing the light of day - but for those without one, it can lead to a shadow life or an uncertain existence.
This is thought to affect millions of people around the world, described as stateless, and 25-year-old South African Arnold Ncube is one of those.
Because he has no state-issued documents, washing cars in the backstreets of Thembisa township near Johannesburg is one of the few ways he can make a living.
He was born in Johannesburg and his father is South African, qualifying him for citizenship here. But when he tried to register for secondary school, he realised he didn't have a birth certificate.
Having been abandoned by his parents - his dad left before he was born and his mum when he was 14 - he could not prove his status.
