Self‐censorship of information, defined as an act of intentionally and voluntarily withholding information from others in the absence of formal obstacles, serves as an obstacle to the proper functioning of a democratic society, because it prevents free access to information, freedom of expression, and the flow of information. It is of key importance in societies, as it blocks information that may shed new light on various societal issues. Nevertheless, it is recognized that in certain cases self‐censorship is necessary. The present article provides a comprehensive conceptual framework for self‐censorship and examines it from various angles with empirical examples. It describes its nature and psychological foundations, the motivations that underlie it, the conditions that facilitate its practice, its societal and individual consequences, and, finally, its measurement challenges.