An array is a sequenced collection of elements of the same data type with a single identifier name. As such, the array data type belongs to the "Complex" category or family of data types. Arrays can have multiple axes (more than one axis). Each axis is a dimension. Thus a single dimension array is also known as a list. A two dimension array is commonly known as a table (a spreadsheet like Excel is a two dimension array). In real life there are occasions to have data organized into multiple dimensioned arrays. Consider a theater ticket with section, row and seat (three dimensions).
We refer to the individual values as members (or elements) of the array. Programming languages implement the details of arrays differently. Because there is only one identifier name assigned to the array, we have operators that allow us to reference or access the individual members of an array.
The operator commonly associated with referencing an array member is the index operator. It is important to learn how to define an array and initialize its members. The index operator is a set of square brackets with an integer value between the brackets that represents the offset from the front of the array.
Multidimensional arrays use one set of square brackets per dimension or axis of the array. For example a table which has two dimensions would use two sets of square brackets to define the array variable and two sets of square brackets for the index operators to access the members of the array.
Because of the complexity for multidimensional arrays, the demonstration program shows a two dimension array and you should study it in conjunction with this module.