An array is an indexed collection of data values. If an array is named monkey and i is an integer, then monkey[i] is one element of the array; monkey[2] is the third element in the array, since arrays always begin counting on zero. An array's value in JavaScript can refer to other arrays, objects, or functions. Arrays that are indexed by strings instead of integers (for example, monkey[matt] as opposed to monkey[2]) are called associative arrays.