Isaiah 53 is a chapter in the Bible that talks about someone called the "Suffering Servant." It's like a story that tells us about what this servant would go through.
The story says that this servant would be rejected and not liked by many people. They would be hurt and have a lot of pain. But the story also says that this servant would take all of the bad things that people do and carry them away, so that everyone could be forgiven.
It's kind of like when you do something wrong, and your mom or dad helps you fix it. The Suffering Servant is doing that for everyone, but on a bigger scale.
The story also says that the servant would die, but it's not an ordinary death. It's a special kind of death that would help save people. But even though the servant dies, they would come back to life again!
Some people believe that this story is talking about Jesus, who they think is the Suffering Servant. They think that Jesus died on the cross to take away our sins, just like the story of Isaiah 53 says.