### Clue: Pieces of software for gas and electricity companies? (9)
### Answer: UTILITIES 
 ### Explanation: Definition: Pieces of software ,gas and electricity companies
 Double defn: 1st: Programs that perform specific tasks to enhance a computer system's efficiency or effectiveness, such as data recovery, virus detection, etc.; and 2nd: Companies that own and/or operate facilities used for generation and transmission and distribution of utilities, ie. electricity, gas and water, to the general public.