An array is a special variable, which can hold more than one value at a time.
If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:
var car1 = "Saab"; var car2 = "Volvo"; var car3 = "BMW";
However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300?
The solution is an array!
An array can hold many values under a single name, and you can access the values by referring to an index number.
var array-name = [item1, item2, ...];
var cars = ["Saab", "Volvo", "BMW"];
The following example also creates an Array, and assigns values to it:
var cars = new Array("Saab", "Volvo", "BMW");
This statement accesses the value of the first element in cars:
var name = cars;
This statement modifies the first element in cars:
cars = "Opel";
Note:  is the first element in an array.  is the second. Array indexes start with 0.
Because of this, you can have variables of different types in the same Array.
You can have objects in an Array. You can have functions in an Array. You can have arrays in an Array:
myArray = Date.now;
myArray = myFunction;
myArray = myCars;
Arrays are Objects
Arrays use numbers to access its "elements". In this example, person returns John:
var person = ["John", "Doe", 46];
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