A system is like a big box of LEGO bricks. Each brick is a part, and when you put them together in a certain way, they build something amazing, like a castle or a spaceship. In a system, each part has a job to do, and they all work together to make something happen. Just like in your LEGO set, if one piece is missing, the whole thing might not work as well.
Think of a system like a big team. Each person on the team has a special role, like a soccer team where some people kick the ball, others defend, and one person is the goalie. The team works best when everyone does their part, and they all help each other to win the game. In a system, every part needs to do its job so everything runs smoothly.
A system can also be like a recipe for baking a cake. You need all the right ingredients, like flour, eggs, and sugar, and you have to mix them in the right order. If you follow the recipe, you get a delicious cake. But if you forget an ingredient or mix them wrong, the cake might not turn out right. Each step and ingredient in the recipe is like a part of the system, working together to make something yummy.