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Objects have properties and methods.

Properties are just values. And methods are just functions that do something with the values.

As you can see in this example:

obj = {
  firstName: "Alen",
  lastName: "Mofo",
  fullName: function(){
    alert(this.firstName + " " + this.lastName);
obj.fullName(); //Prints "Alen Mofo"

firstName and lastName is a property. fullName is a method.