Various control concepts developed for chaotic systems are described i
n this paper. By control, we mean influencing the system operating in
a chaotic regime in such a way as to achieve a desired type of dynamic
behavior (''goal'') that typically could be a fixed point or periodic
orbit. The control concepts described here include system parameter v
ariation, chaotic oscillation absorber, entrainment, linear feedback c
ontrol, and methods for stabilizing unstable periodic orbits. Advantag
es and drawbacks of these methods are described.