A survey of the emerging field termed "control of chaos" is given. Several major branches of research are discussed in detail: feedforward or "nonfeedback control" (based on periodic excitation of the system); "OGY method" (based on linearization of the Poincaré map), "Pyragas method" (based on a time-delay feedback), traditional control engineering methods including linear, nonlinear and adaptive control, neural networks and fuzzy control. Some unsolved problems concerning the justification of chaos control methods are presented. Other directions of active research such as chaotic mixing, chaotization, etc. are outlined. Applications in various fields of engineering are discussed.