Web Design Glossary...
Array
In programming, an array is an indexed collection of data values. For instance in PHP, and array is a container for a number of variables which all have the same name, but each has a different index. Each member of the array is called an element. You can create arrays in the same way you create variables, as long as you remember to put square brackets around them to denote the index. By default, arrays are zero-based, that is, the first element of the array has an index of zero.