An array in Java is defined by a type then '[]'. Arrays are lists of variables that are all stored within a single variable. Arrays in Java can only have elements that are of the same type, for example an int[] array or a String[] array. In order to access a specific variable within an array, the index, or position, of the variable must be used as such: arr[1]. This would return the 2nd element in the array because arrays begin their indexes at 0 instead of 1!