Abstract: Spintronics refers commonly to phenomena in which the spin of electrons in a solid state environment plays the determining role.In a narrow sense Spintronics refers to spin based electronicsi.e. spin-polarized transport in metals and semiconductors. The goal of this applied Spintronics is to find effective ways of controlling electronic properties, such as the current or accumulated charge, by spin or magnetic field, as well as of controlling spin or magnetic properties by electric currents or gate voltages. The ultimate goal is to make practical device schemes that would enhance functionalities of the current charge based electronics.Spintronics devices are based on a spin control of electronics, or on an electrical and optical control of spin or magnetism. Most semiconductor device systems are still theoretical concepts, waiting for experimental demonstrations.