The lesson is based on current state of quickly evolving field of spintronics, meaning electronics based on electron's spin. The subject is covering most of important directions of current spintronics. It starts with definition of spin-polarized current and spin accumulation. Then, the idea of generation and detection of spin-polarized current in non-magnetic materials is discussed (by spin injection or by spin pumping). Furthermore, the magnetoresistive effects (AMR, GMR, TMR) are discussed, as well as spin moment (spin transfer). It continues by several prototypical examples of those effects in lateral systems and industrial applications. Finally, short introduction to spin-calorimetry and to materials used in spintronics is provided.