An ARRAY is an orderly grouping of items, usually arranged in a rectangular or linear formation. It is a common data structure used in computer programming and mathematics. An ARRAY can be used to store multiple values of the same type, such as numbers, strings, or objects. Arrays are often used to represent tables of data, such as a spreadsheet or database table. They can also be used to store collections of objects, such as a list of people or a list of products.