What is slang? Is it the same as China's idiom?

I won't give a very profound definition of slang, but I can explain it in plain words. Slang is a common saying, which is equivalent to a more colloquial language that everyone knows when we communicate. Just like CCTV's program "American Slang", it talks about some local American slang, but the language that everyone knows is generally more vivid and expressive, which plays a unique role in expressing feelings such as strength, wonder, hobbies and admiration, or expressing humor, ease and humor. The answer is not as good as the above. I wonder if you are satisfied ~o(∩_∩)o ...