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The number at the front of the term indicates the lines of vertical resolution. Thus, 720p and 1080p have 720 and 1080 lines respectively of vertical resolution. Both 1080p and 1080i screens have 1080 lines of vertical resolution (we'll explain the difference between these two below).

A High Definition TV with 1080p resolution is composed of two million pixels (1920 x 1080), while a 4K TV (aka Ultra High Definition) has over eight million pixels (3840 x 2160).

But, it comes at a trade-off, sacrificing resolution / image quality for speed. So, better is, in some sense, subjective. But, just in terms of raw pixel count, 1024x768 is considerably fewer dots on the screen when compared to 1080p, which is considerably fewer dots on the screen vs. 4K, and so on.

For example, 1024x768 refers to a display capable of 1,024 pixels in width and 768 pixels in height. Another specification given is aspect ratio, this refers to the ratio between the width and the height of the display.

Any resolution above Standard definition (SD) is considered high definition. SD is any resolution lower than 720p (1280 x 720). 1280 x 800 is considered HD, but is a non-standard resolution, so for some programs, you may see a black bar along the bottom of the screen, such as when running a 720p video full screen.

A 1920x1080 resolution is Full HD. For the average consumer, a Full HD monitor is generally considered good.

In the case of a monitor with an industry-standard Full HD 1080p resolution, this display has a resolution of 1920 x 1080. This means that the screen will have a width of 1,920 pixels while the height of the screen will be 1,080 pixels. This results in a grand total of 2,073,600 pixels on-screen.

Originally Answered: Which one is correct when describing the screen resolution of smartphone 1920x1080 or 1080x1920? Both are correct. The first number refers to the number of pixels lengthwise (horizontally) in an image and/or video. The next one refers to number of pixels widthwise (vertically).

For example, 1024x768 refers to a display capable of 1,024 pixels in width and 768 pixels in height. Another specification given is aspect ratio, this refers to the ratio between the width and the height of the display.

720p = 1280 x 720 - is usually known as HD or "HD Ready" resolution. 1080p = 1920 x 1080 - is usually known as FHD or "Full HD" resolution. 1440p = 2560 x 1440 - is commonly known as QHD or Quad HD resolution, and it is typically seen on gaming monitors and on high-end smartphones.