Data compression, encoding information using fewer bits

Audio level compression, usually artificially introduced Gain compression to improve the perceived quality of audio

Audio data compression

Gas compression, raising the pressure and reducing the volume of gases

Gas compressor

Video compression

Compression ratio, a number that predicts the performance of any internal-combustion engine

Compressibility, a measure of volume change resulting from pressure (typically for fluids)

Image compression

Compression artifact, noticeable defects in audio or video that has been compressed

Gain compression in electronic amplifiers, which is a result of device non-linearity

compress, a UNIX program

KOMPRESSOR, an electronic musician.

Compaction may refer to: Soil compaction, for mechanically induced compaction near the ground surface Compaction (geology), part of the process of lithification involving mechanical dewatering of a sediment by progressive loading under several km of...

Reciprocal of the bulk modulus (typically for solids)

Compressor (software), Final Cut video and audio compression and encoding application

Compression arch suspended-deck bridge, a compression arch rises above the deck

Physical compression, the result of the subjection of a material to compressive stress

Under Armour

Decompression has several meanings: in physics, decompression is the release of pressure and is the opposition of physical compression in medicine and aviation, decompression can refer to decompression sickness in surgery, decompression can refer to a...

. Expansion may refer to: In physics: expansion of space, thermal expansion, expansion fan. In computer hardware: an expansion card In computer programming: in-line expansion In computer gaming: an expansion pack (in real time strategy games like...

Bandwidth compression, in telecommunications

Compression (functional analysis), in mathematics

Compression (geology), a system of forces that tend to decrease the volume of or shorten rocks.

Compression in zoology and paleontology refers to where an animal, or part of an animal is shorter or narrower compared with other animals in the same group; eg the body of a lizard may be compressed (flattened) so it can better fit into crevices under rocks.