Imagine you are in a big playground with lots of kids from different countries. Some kids might speak a different language or have different rules at home. But all of you want to have a fun and safe time on the playground.
A multinational force is like that. It's a group of soldiers or police officers from different countries who work together to make the world a safer place. Sometimes there are big problems, like wars or natural disasters, and one country might not be able to handle it on their own. That's when other countries can come together and form a multinational force to help out.
Like the kids in the playground, the soldiers in a multinational force might have different ways of doing things or speak different languages, but they have to work together to get the job done. It's important that everyone follows the rules and works together as a team to keep everyone safe.
At the end of the day, just like how you all want to have fun and play together in the playground, the soldiers from different countries want to make the world a better place and work towards peace and security for everyone.