Compression Software

Data compression software is a utility that makes a file, or a set of files, smaller. It works by storing the same information in fewer bits.

Less storage space used

Because each file is built from fewer bits, it occupies less storage space, leaving room for more files on the same device. For example, a folder of design work taking 120 MB might shrink to about 60 MB once compressed, freeing 60 MB of space for other work. That extra room means you may not need to buy a bigger drive as soon.

Faster to send and download

Compression is needed because moving data takes time. Bandwidth is the amount of data a connection can carry each second, and every bit you send uses some of it. Fewer bits means the file arrives sooner and the connection is left free for other traffic. A file that takes ten minutes to upload from home might take five once compressed to half its size, and a class of 30 pupils downloading the same resource pulls far less data through the school network.

It must be decompressed first

A compressed file is stored in a packed format, so most programs cannot open it as it stands. It has to be decompressed (often called extracting) before it can be used normally. Decompression unpacks the file back into a form the software can use, so it opens, plays or edits normally again. Compression only changes size: it does not improve quality, and it does not keep a file private, which is what encryption software is for.