Matthew 15 is a part of the Bible that tells a really old story about Jesus and some people who didn't like him. Matthew was a man who wrote down this story a long, long time ago so that people could learn from it and remember it even today.
In this story, Jesus and his followers were walking around when some leaders from a church came up to them and asked why they didn't follow a special rule that their church had made up. The rule was to wash their hands in a special way before eating.
But Jesus didn't like this rule because he thought it was more important to be kind and loving to other people. He told the leaders that what really mattered was what you said and did, not just the rules you followed.
Then, some more people came up to Jesus and asked for help because they were sick. Jesus healed them and made them feel better. This made people happy and they were amazed by his powers.
Overall, the story is about how Jesus taught people to focus on being kind and loving to others instead of just following rules. It also shows how Jesus had the power to heal people and make them feel better, which made others believe in him even more.