Bar Code

A bar code is an optical and machine-readable form of data used to identify objects. A bar code allows a machine to retrieve a great deal of information about an object as soon as the object is identified through a unique visual code format created by drawing adjacent lines with variable widths and spaces. Bar codes were originally linear, one-dimensional representations of objects. Later, advanced two-dimensional data representations appeared in forms like dots, rectangles and other two-dimensional geometric shapes.