Compression - Word Drop

Compression describes the algorithms that reduce the size of a file. Smaller files need less ______ space on a disk and can be sent in fewer ______, so transmission across a network is quicker. Sound and video can also be ______, which means playing them while they are still being sent.

The first type, ______ compression, permanently removes some data and is used on images, sound and video. It can leave small mistakes called digital ______, which often appear as noise where colours contrast.

The other type, lossless compression, shrinks a file without losing any data. It looks for repeated ______ and stores each one only once, along with how many times it occurs. Text is often squeezed by building a ______ of repeated words. Each word can then be replaced by a short code. The reverse process, ______, turns the compressed data back into its original form.

A common lossless format is ______, which is often used to compress files and folders. Sound files are often stored as ______, which throws away quiet sounds that most people cannot hear.