Millions of children never see inside a classroom. Others drop out due to overcrowded classes, conflict, or simply because they're a girl.
And here in the UK, the poorest children do less well at school than wealthier classmates - and low literacy is linked to low pay and unemployment.
There's a lot that can get in the way of education. But from Leeds to Liberia, children's love of learning is universal. Because they know it's the key to a world of possibilities.
We make sure children keep learning whatever their circumstance. Whether they're recovering from natural disasters, facing violence, or at risk of child marriage.
And in the UK, we're working to improve early years learning and keep childcare costs on the political agenda.