Poster title: Multi-wavelength polarimetry as tracer in star and planet formation Abstract: I will present polarimetry as tracer in different stages of star and planet formation, from star-forming clouds and protoplanetary disks to planetary systems. Polarimetry provides access to distribution and characteristics of dust grains and magnetic fields contained in these clouds and disks, and is able to detect and characterize exoplanets by observing the starlight reflected by the planets.