I found this great info graphic on UHD or 4k TVs made by Drew Burstein owner and director of a company called Frame Your TV. https://www.frameyourtv.co.uk/mirror-tv/
These are some of the questions answered in the graphic
• The first demonstration of HDTV took place in America in 1981 and the picture quality on our TVs has slowly improved from there.
• What are pixels and resolutions all about?
• Why is 4k better than regular HDTV? Is a 4K TV worth buying?
Click to open the graphic.