A) Abbreviation for synchronization. Usually refers to the synchronisation pulses necessary to coordinate the operation of several interconnected video components. When the components are properly synchronized, they are said to be “in sync.” b) Signals which control the sweep of the electron beam across the face of the display. The horizontal sync, or HSYNC for short, tells the display where to put the picture in the left-toright dimension, while the vertical sync (VSYNC) tells the display where to put the picture from top-to-bottom. c) The portion of an encoded video signal which occurs during blanking and is used to synchronise the operation of cameras, monitors, and other equipment. Horizontal sync occurs within the blanking period in each horizontal scanning line, and vertical sync occurs within the vertical blanking period.