Okay, so the Church of the Holy Sepulchre is a really important building for people who believe in Jesus. It's located in a city called Jerusalem, which is in a country called Israel. The church is built on a spot where a long time ago, Jesus was supposedly crucified and then buried in a tomb.
Now, a tomb is like a special place where people who have died are placed. It's often made of stone and looks like a little room. After Jesus was put in the tomb, something really amazing happened - he came back to life! This is something that many people who believe in Jesus think is a miracle.
So, the Church of the Holy Sepulchre is a place for people who believe in Jesus to come and visit the spot where he was buried and rose again. It's a very old and important building, with lots of different rooms and decorations inside. Sometimes people come from all over the world to visit the church and pray or sing songs.
Of course, not everyone believes the same things about Jesus or the church. Some people believe that the story of his resurrection is just a story, or that the church is not a special place. But for people who do believe, the Church of the Holy Sepulchre is a very special and meaningful place.