The highest display resolution of the Samsung UN48JU7500 is 4K Ultra HD. That's over four times the display resolution of a Full HD TV, which is the most common display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is actually the best display resolution across all TVs of a similar spec and age to the UN48JU7500.
An HD Ready HD type is the worst display resolution amongst comparable types of TV.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.