The United Nations is like a big group of grown-ups who work together to make the world a better place. They have different jobs like helping poor people, giving medicine to sick people, and making sure everyone has enough food to eat. One of the grown-ups in the United Nations is called the United Nations Office for the Coordination of Humanitarian Affairs, or UNOCHA for short.
UNOCHA is kind of like a traffic cop for all the other grown-ups in the United Nations. They help make sure that everyone who needs help in times of crisis, like when there is a natural disaster or war, gets the help they need. UNOCHA works with governments, other United Nations agencies, and non-governmental organizations to make sure that all the different types of help get where they need to go.
So imagine you're in a really big park with lots of playgrounds and you want to make sure that all the kids who need help getting to the playgrounds get there safely. UNOCHA is the grown-up who helps make sure that everyone gets to the right playground and gets the help they need if they fall down or get hurt. They make sure that everyone is safe and playing together nicely.