Porous silicon has stimulated a great deal of excitement as a hot subject of research ever since the discovery of visible light emission from it in 1990. Vigorous removal material which has generated a strong controversy. Notwithstanding this controversy, a number of light emitting diode (LED) structures have already been demonstrated which may lead to highly useful, practical optoelectronic devices expected to revolutionize the optoelectronics and photonics technology. An overview .of the exciting developments in the field are presented in this paper.