What does it mean?
You cannot have a worse punishment than the crime you committed. Torture is not allowed either.
Amendment 8 Cartoon
Your punishment shouldn't be worse than what you did. Like for example, you can't go to jail for a long time for stealing a candy bar.
Why is it important?
This amendment is important because excessive punishment is unjust. Someone who broke into someone's house should not get the same punishment as someone who committed a murder.