App is short for Application software. It could also refer to: *APP (file format), filename extension for applications on a number of platforms *Adjusted Peak Performance, a metric to measure computing performance in 64-bit processors and above *Advanced Placement Program *African Prisons Project, a UK based NGO *The Alan Parsons Project, a progressive rock band *Alberta Pension Plan, a proposed alternative to the Canada Pension Plan *Alberta Provincial Police, a Canadian police force from 1917-1932 *Amyloid precursor protein, a protein fragment associated with some neurological disorders *App Store, Apples store for delivering applications to the iPhone OS platform *Appalachian State University, a colloquial reference to the university *Appetizer *Application software, a type of computer program *Asia Pulp & Paper *Asia-Pacific Partnership *Associated Press of Pakistan *Atom Publishing Protocol, a protocol for creating and updating web resources