Mark 15 is a chapter in a book called the Bible. This chapter talks about what happened to a man named Jesus who lived a long, long time ago. Some people did not like Jesus and they treated him very badly. They made fun of him, hit him, and hurt him.
Eventually, they decided to kill him by nailing him to a cross made of wood. This is called a crucifixion. Even though it was very painful, Jesus did not fight back or get angry. He stayed calm and peaceful.
After Jesus died on the cross, some other people took his body and put it in a tomb which is like a big stone room. They were very sad and thought that they would never see Jesus again.
However, a few days later, something amazing happened. Jesus came back to life! He appeared to his friends and they were overjoyed. This event is called the Resurrection and is a very important part of the Christian religion.
So, Mark 15 tells the story of Jesus and what happened to him. It teaches us about being kind even when people are mean to us, being strong when things are tough, and that good things can happen even when we think all is lost.