Deception is providing misleading information to others.

• Animals often attempt to deceive predators or prey by their appearance or behavior.
• Deception is used to hide secret information.
• Camouflage is a form of visual deception used in war.
• Propaganda frequently involves deception.
• Deceiving one's opponent is important in many aspects of game theory.

See also:

• Secrecy
• Communications deception
• Electronic deception
• Psychological warfare
• Misdirection

References:

• Bruce Schneier, Secrets and Lies