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In computing, resolution refers to the number of pixels that make up an image or a display, defined as the horizontal and vertical pixel count. A higher resolution means more pixels, resulting in a sharper, more detailed, and clearer image because the individual pixels are smaller and create a finer picture. For example, a screen with a \(1920\times 1080\) resolution displays 1920 pixels across the width and 1080 pixels down the height. 

Key aspects of resolution 

Pixels: Computers create images by using millions of tiny, colored squares called pixels. Resolution is a measurement of these pixels.

Display resolution: This is the total number of pixels a screen can display horizontally and vertically, such as \(1920\times 1080\) (Full HD) or \(3840\times 2160\) (4K).

Image resolution: This refers to the number of pixels in an image file, often expressed in Pixels Per Inch (PPI) or Dots Per Inch (DPI). A higher PPI/DPI means more detail for a given physical size.

Clarity and detail: Higher resolution provides more detail and clarity. A low-resolution image, when stretched, may look blocky or blurry because the large pixels become visible.