The number of pixels per inch in a picture.

Dots per inch. Unit used for the resolution of a picture.

Additional data stored in a picture file. Includes with and height in pixels, color depth and resolution

The number of bits used to store the color value of a pixel

The time gap (in ms) between two samples in an audio file.

The number of bits used per second (bps) in a sound file.

The number of bits used per sample.

The number of samples used per second.

Reducing the size of a file resulting in a loss of quality.

Reducing the size of a file without losing quality.

A collection of characters (e.g. letters, punctuation signs, digits) used in a language.

A character set consisting of 127 characters used in the English language.

A character set consisting of 255 characters.

A character set used by several languages such as Arabic or Mandarin.