noun [ˈsɔft.wɛɻ/
Encoded computer instructions, usually modifiable (unless stored in some form of unalterable memory such as ROM). Compare hardware.
The "software" comprising the carefully planned interpretive routines, compilers, and other aspects of automative programming are at least as important to the modern electronic calculator as its "hardware" of tubes, transistors, wires, tapes and the like.
Wikipedia foundation.