(computing) A software program that performs portscans.
(computing) Encoded computer instructions, usually modifiable (unless stored in some form of unalterable memory such as ROM).
(military) The human beings involved in warfare, as opposed to hardware such as weapons and vehicles.
(computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory;
‘the market for software is expected to expand’;
Software is a collection of instructions and data that tell a computer how to work. This is in contrast to physical hardware, from which the system is built and actually performs the work.