Do you remember NTSC AND PAL?

[SvennoJ]

PAL was better for movies, higher resolution (576 scan lines vs 480 for NTSC) and no 3:2 pull down filter. Movies ran 4% faster on PAL in Europe, displaying 25 frames per second from the 24 frames per second original. It was too small of a speed up to interfere with sound.

Movies converted to NTSC had the annoying 3:2 pulldown filter or telecine process that introduces judder. Converting every 4 frames into 5 by interlacing different frames together. That judder still exists today, except no more interlacing, thus a simple repeat of every 4th frame to convert to 30fps. On (4k) blu-ray you get true 24p output, although many tvs have 3:2 pulldown detection and will correctly display it at 24fps.

For games the reverse, running 8% slower on PAL and black borders for the 96 fewer scan lines. Consoles also had that horrible RCA composite video output, always suffering from low color resolution and color bleeding. S-VHS was a bit better until component video became an option. Component cables could actually carry 1080p looking just as good as HDMI. The original 360 didn't have HDMI output yet. I spend $300 on a custom made component video cable to run through the walls and ceiling to my projector, just for the 360.

Now we have 720p (cable tv), 1080i (cable tv), 1080p (streaming), 2160p (streaming), 24hz (movies), 50hz (BBC documentaries), 60hz (tv)
As well as HDR10, Dolby Vision, HLG, Samsung HDR10 Plus, Technicolor advanced HDR
And we still have Stereo, PCM, Dolby Pro-logic, Dolby Pro-Logic Plus, AC3, DTS, Dolby True HD, DTS HD-MA, Dolby Atmos

Different versions of HDMI supporting different formats, the fun never ends.