Electronic and electro-optic devices are frequently used to display images obtained from the computer processing of data. Images, or digital pictures, are generally two-dimensional data structures that convey spatial information to the viewer. Images are collected through various means, from digital cameras to laser radar scanning systems and, once stored in a computer, can be manipulated mathematically to accomplish many different objectives. The improvement of images for viewing or analysis and computer interpretation of image content are among those objectives. This module explains the terminology associated with images, how images are acquired and stored, and how images are displayed.