Array: is a consecutive group of memory locations that all have the same type. To refer to a particular location or element in the array, we specify the name of the array and the position number of the particular element in the array.
A program refers to any one of the elements in its array by giving the name of the array followed by the position number of the particular element, in square brackets →[].
The position number is more formally called a subscript or index. The first element in every array has subscript 0, and is sometimes called the zeroth element.