The Array is the most commonly used Data Structure. An array is a collection of data elements that are of the same type (e.g., a collection of integers, collection of characters, collection of doubles). OR Array is a data structure that represents a collection of the same types of data. The values held in an array are called array elements An array stores multiple values of the same type – the element type The element type can be a primitive type or an object reference Therefore, we can create an array of integers, an array of characters, an array of String objects, an array of Coin objects, etc.