By definition in Joint Publication 3-13,
"IO are described as the integrated employment of electronic warfare (EW),
computer network operations (CNO),
psychological operations (PSYOP),
military deception (MILDEC), and
operations security (OPSEC),
in concert with specified supporting and related capabilities, to influence, disrupt, corrupt or usurp adversarial human and automated decision making while protecting our own."
[1] Information Operations (IO) are actions taken to affect adversary information and information systems while defending one's own information and information systems.
Publisher: United States. Joint Chiefs of Staff