HD, Full HD, Quad HD, Ultra HD - resolution size in pixels

What is the difference between screen resolutions HD, Full HD, Quad HD and Ultra HD ? What are the sizes in pixels of each screen resolution ?

HD - High definition screen resolution is 1280 x 720. Also the resolution 1366 x 768 is considered as HD. There is as well HD+ resolution with size 1600 x 900.

Full HD - Full high definition screen resolution is 1920 x 1080.

QHD - Quad high definition screen resolution is 2560 x 1440.

UHD - Ultra high definition screen resolution 4K is 3840 x 2160. There is also cinema 4K UHD resolution 4096 x 2160, 5K UHD resolution 5120 x 2880 and 8K UHD with size 7680 x 4320.