Whenever you watch a video on your mobile or computer, then a lot of that picture is played in a systematic way.
These pictures are called frames, and with the help of these frames, you can see moving images in the form of videos.
To understand digital video in a better way, you have to understand the resolution and device aspect ratio.
For example, if you talk about a monitor with a full HD resolution, then you get 1080 pixels from top to bottom.
Whereas on the right and left side of the same monitor, 1920 pixels are present, and when we mix these two figures together, you get a figure of 2,073,600 pixels in your monitor.
After which if we talk about the aspect ratio, then you must have noticed that the old monitors often have a square type 4:3 aspect ratio.
But now you mostly get to see monitors with wide angle 16:9 aspect ratio, that means you can see your picture in cinema look.
After this, the way your monitor displays the video or picture, it is called interlaced and progressive scanning.
The first method known as interlaced only scans half the pixels, whereas progressive scanning scan all the pixels from top to bottom.
And the speed at which this scanning happens is called refresh rate, and most of the monitors these days work at 60Hz refresh rate.