Deception in The Catcher and the Rye takes the form of what narrator Holden Caulfield calls "phoniness." This refers to anything and everything from pretense to social snobbery to language to appearances – all elements of the adult world as opposed to the world of phoniness. Disgusted with this falsity, Holden seeks to escape what he sees as the prescribed path of education, jobs, and money-making.
Although Holden appears to judge only adults as "phonies," it is clear from his pronouncements about the topic that anybody can fall into his category of phony.