The "720" indicates the number of vertical pixels, while the "p" stands for progressive scan , meaning each line of the image is drawn in sequence for a smoother appearance compared to interlaced video.
On smaller screens like smartphones or tablets, the difference between 720p and 1080p is often negligible. However, for large televisions or projectors, 1080p or 4K is generally preferred for sharper detail. 720p - Википедия @Rkcineplex 720p
The designation refers to a specific video display resolution of 1280 x 720 pixels . It is a popular standard for digital distribution because it strikes a balance between visual quality and file size. The "720" indicates the number of vertical pixels,