Definition of Bitmap

A picture made from a series of small dots, much like a piece of graph paper with certain squares filled in to form shapes and lines.

A data structure in memory that represents information in the form of a collection of individual bits. A bit map is used to represent a bit image. Another use of a bit map in some systems is the representation of the blocks of storage on a disk, indicating whether each block is free (0) or in use (1).