172_720p.mp4 -

: This indicates the resolution . Lenovo defines 720p as High Definition (HD) with a frame size of 1280x720 pixels. The "p" stands for progressive scan, which means the image is drawn line-by-line for smoother motion.

The filename is a generic, machine-generated label typically used by Content Delivery Networks (CDNs) and video hosting platforms to identify a specific version of a video file. 172_720p.mp4

: If you found this in your browser cache or temporary files, it’s a segment of a video you recently watched. : This indicates the resolution