What are the differences between UHD, HD, and SD video resolutions?

The main differences between UHD, HD, and SD video resolutions are in the level of detail and clarity they provide. UHD (Ultra High Definition) has the highest resolution and offers the sharpest image quality with four times the pixels of HD. HD (High Definition) provides a good balance of quality and file size, while SD (Standard Definition) has the lowest resolution and is less sharp and detailed compared to HD and UHD.