Romans 3:23: "all people have sinned and are not good enough for God's glory."
Everyone has sinned. Sin is anything that does not please God. Everyone has done something wrong in their life like lying, stealing, or having a bad attitude. We are all born in sin. We are born with a "want to do" bad things. The color black is for the darkness of sin. Like getting our clothes dirty when we play outside, we are stained with sin.
The Bible says that sin must be punished. That means to be separated from God forever and ever. There is nothing man can do to solve this problem.
But God has a wonderful plan so that you and I don't have to be punished for our sins.