A madhhab is like a team of people who play soccer together. Just like each soccer team has its own coach and players who have different skills, a madhhab is like a group of people who follow the same rules about how to practice Islam.
Each madhhab has its own leader, called an Imam, and followers who believe that their way of practicing Islam is the right way. They have different opinions on things like prayer, fasting, and how to interpret the Quran, but they all agree on the essentials of Islamic faith.
Think of it like making cookies with your friends. Everyone has their own recipe for cookies, and they might use different ingredients, but they all end up with delicious cookies in the end. Similarly, madhhabs might have different ways of practicing Islam, but they all believe in the same teachings and principles.