Video resolution refers to the amount of detail an image holds, measured in pixels. It is typically expressed as width x height, such as 1920x1080 for Full HD. Higher resolutions provide clearer and sharper images, making them ideal for larger screens. Common video resolutions include 720p, 1080p, and 4K. As the resolution increases, the number of pixels also increases, resulting in better image quality. However, higher resolutions require more storage space and processing power, which can affect playback on some devices.