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The vertical resolution (number of horizontal lines) on a TV or computer screen. The term typically is used with TVs; for example, HDTVs have 720 or 1,080 lines, while analog TVs used 525 or 625 lines, several of which were invisible between frames.

Resolution indicates the number of pixels that are displayed per inch for an image (or pixels per centimeter). Most computer monitors display at resolutions of 72 pixels per inch or 96 pixels per inch.

PPI (Pixels Per Inch) refers display resolution, or, how many individual pixels are displayed in one inch of a digital image. DPI (Dots Per Inch) refers to printer resolution, or, the number of dots of ink on a printed image.

To calculate the resolution in megapixels, multiply the number of pixels of length and width and divide them by mega (1 million).

Definition 2: Resolution can be expressed as the total number of pixels. With megapixel cameras, the resolution is generally the total number of pixels, divided by 1,000,000, and rounded off.

Understanding the DPI ratio We can imagine DPI as the number of pixels which would be needed for one inch (2.54 cm) of printed paper. Usually, for a quality print, we need about 300 DPI, meaning that an image the size of an A4 paper should count 2480x3507 pixels.

For example the resolution 1920×1080 (which is 1080p) creates an image that is 1920 pixels wide and 1080 pixels tall. The aspect ratio of an image describes the proportional relationship between its pixel width and height.