Imagine you have two types of toy boxes: one called “List” and the other called “Set.” Each box holds your toy cars, but they follow different rules.

List

A List is like a special toy box where you can keep your toy cars in a specific order. When you put a car in, it stays where you put it. If you put a red car first, then a blue car, and then a green car, they will always stay in that order: red, blue, green.

• Order: The order you put your cars in matters.
• Duplicates: You can have more than one of the same car. If you have three red cars, you can put all three in your List box.

Set

A Set is like a magical toy box where the order doesn’t matter, and you can’t have duplicate cars. If you put a red car in, then a blue car, and then another red car, the box will only keep one red car and one blue car.

• No Order: The cars don’t stay in the order you put them in.
• No Duplicates: You can only have one of each car. If you try to put in two red cars, the Set box will only keep one.

Summary

• List: Keeps things in the order you put them and allows duplicates.
• Set: Doesn’t care about order and only keeps one of each item.

So, if you like to keep your toys in a specific order and have multiple of the same toy, use a List. If you want to make sure you only have one of each toy and don’t care about the order, use a Set.