Video amplifiers are electrical circuits used to amplify the signal strength of a video signal. They are used to increase the signal voltage, current, or both so that the signal can be transmitted to different locations or devices at a higher level of quality and clarity. Video amplifiers are essential in high-definition television (HDTV) systems and surveillance systems, as they provide clear and present images even in long distances. They are also used in video splitters, distribution amplifiers, line drivers and other video/audio signal processing systems. Video amplifiers can also provide gain adjustment, frequency compensation, and signal conditioning, enabling them to be used for very specific requirements.