Okay kiddo, so you know how when you play a game with your friends, you follow a certain set of rules so that everyone knows how to play and what is expected of them?
Well, in the grown-up world, when different countries want to talk to each other about things like trade or war or making peace, they also follow a set of rules or guidelines called a protocol.
These rules help make sure that everyone is respectful and polite to each other, and that they know how to act and what to say during their meeting.
For example, when two countries want to talk about a problem they are having, they might agree to meet in a certain place, at a certain time, with a certain amount of people. They might also agree to dress in certain clothes and speak in a certain way.
This might seem like a lot of rules, but it helps make sure that everyone is on the same page and that the conversation goes smoothly.
So, in summary, a protocol is a set of rules or guidelines that different countries follow when they are meeting to talk about important things. It helps make sure everyone knows how to behave and what to expect during the conversation.