So imagine you're playing with your toys and you have a very special toy that you don't want anyone else to touch, but sometimes your friends come over to play with you. You want to make sure your special toy is safe, so you come up with a plan to protect it.
Well, countries around the world have a special type of toy that is really dangerous called nuclear weapons. These weapons have the power to do a lot of damage and hurt a lot of people.
The Global Initiative to Combat Nuclear Terrorism is a plan made by countries around the world to protect people from these dangerous toys. The plan includes working together to stop bad people or countries from getting their hands on nuclear weapons, making sure nuclear materials are handled safely, and making sure countries have plans in place to deal with any emergencies that might happen.
Just like you want to keep your special toy safe, countries around the world want to keep their people safe from nuclear weapons, and this plan helps them do that.