Okay kiddo, do you know what testing is? When you test something, you check it to make sure it works the way it's supposed to, right?
Great! So, a release candidate is like the final test before something new gets released to the public, like a new toy or game. The people who made the toy or game test it a lot to make sure everything works perfectly, but they can't test everything, so they want to get other people to test it too.
That's where the release candidate comes in. It's like a special version of the toy or game that's almost ready to be released, but they give it to a few people to test it out and see if there are any problems they missed. If those people don't find any big problems, then the toy or game is good to go and can be released for everyone else to play with.
So a release candidate is kind of like a final test to make sure everything is in order before releasing something new to the public. Pretty neat, huh?