Why do we need THIS key word in constructors?

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Particularly in JavaScript object oriented programming:

If I have a class like this, for example:

class Animals{
constructor(name, species){
this.name = name;
this.species = species;
}
}

Why do we need to use this.yyyy = yyyy in the constructor? I have read explanations many times but still can’t get it, please explain like I’m 5

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