Communication Jamming is any action involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack of an enemy, or impede enemy assaults via the spectrum. In military or Defence, it is termed as Electronic Warfare or COMJAM. Electronic Warfare is any military action involving the use of the EM spectrum to include directed energy (DE) to control the EM spectrum or to attack an enemy.

This includes self-protection, standoff, and escort jamming, and antiradiation attacks. COMJAM is a specialized tool that enhances many air and space functions at multiple levels of conflict.