Good afternoon, answer me please. What is the side chain ?? It is possible in detail

Hello, this is the block that is separated from the parent. But attached with a two-way binding.
Well, what does it give? Please explain to the newcomer as clearly as possible

As I understand it gives the assets the opportunity to be interchangeable. And just as easy to navigate the chain
hello we should read the white paper to learn about the project I do not think of the negative for the project here to help identify the project.
so do not worry about Callisto because everyone will do it to recognize the CLO token.