Following are the basic array concepts:
An array is a special variable, which can hold more than one value at a time.We can create array either by using Array Constructor or array literal.
An array value can be accessed by its index value.
In Javascript, Arrays are special type of objects, as the members of the array could be accessed by using the names just like objects.
The length property of an array returns the length of an array.
To add element to an existing array following methods are used : Array push method, Add element using length property, Add element using array index.