720p HD refers to a high-definition video resolution of 1280x720 pixels. The "p" stands for "progressive scan," meaning that each frame is drawn sequentially, providing a smoother image compared to interlaced formats. This resolution is commonly used in various media, including television broadcasts, streaming services, and video games. This format is considered the entry level of high-definition quality, offering a clearer picture than standard definition (SD) but not as sharp as higher resolutions like 1080p or 4K. It is often used for online videos and is suitable for smaller screens, such as smartphones and tablets.