Video signals are electrical signals that carry visual information, allowing images and videos to be displayed on screens. These signals can be analog or digital, with analog signals representing images as continuous waves, while digital signals use binary code (0s and 1s) to represent visual data. Common formats for video signals include HDMI, VGA, and Composite Video. The quality of a video signal is influenced by factors such as resolution, frame rate, and color depth. Higher resolution means more detail in the image, while a higher frame rate results in smoother motion. Color depth refers to the number of colors that can be displayed, impacting the overall visual experience.