South-South cooperation is when countries in the "Global South" (countries that are not as wealthy or powerful as those in the "Global North") work together to help each other. They do this by sharing their resources, knowledge, and skills.
This is like when you and your friends share your toys with each other. You may have a cool toy that your friend doesn't have, but they have another toy that you want to play with. So, you share your toys with each other, and everyone gets to have fun and play with something new.
Countries in the Global South might work together to share things like food, medicine, or technology. For example, one country might have a lot of fresh water, while another country does not. So, they might work together to share the water and make sure everyone has enough to drink.
South-South cooperation is important because it helps countries that may not have a lot of resources or power on their own. By working together, they can support each other and create stronger, more resilient communities. Just like how you and your friends can do more and have more fun together than you can by yourself.