Video quality refers to the level of detail and clarity in a video. It is determined by factors such as resolution, frame rate, bit rate, and compression techniques used. Poor video quality can result in blurry or pixelated images, low contrast, and a lack of sharpness.

There are several types of video quality:

1. Standard Definition (SD): This is the lowest level of video quality, typically characterized by a resolution of 480p (720 x 480 pixels) or lower. SD videos are commonly found on older devices or low-resolution displays.

2. High Definition (HD): HD videos offer a higher level of quality with resolutions of 720p (1280 x 720 pixels) or 1080p (1920 x 1080 pixels). They provide sharper and more detailed images, suitable for most modern devices and displays.

3. Ultra High Definition (UHD) or 4K: UHD videos have resolutions of 3840 x 2160 pixels, delivering a significantly higher level of detail and clarity compared to HD videos. They are commonly used for large displays and offer a more immersive viewing experience.

4. HDR (High Dynamic Range): HDR videos provide a wider range of colors and contrast, resulting in more vibrant and realistic images. They can enhance the overall video quality by providing greater detail in both dark and bright areas.

Improving video quality can be achieved by capturing videos with higher resolution cameras, using higher bit rates during encoding, and reducing compression to preserve more detail. Additionally, optimizing internet connection speed and using compatible devices and displays can also contribute to better video quality.