The Point Contact Andreev Reflection (PCAR) technique [  ,  ] is sensitive to the spin polarization of the current in a ferromagnet (F) interfaced with a superconductor (S). The main conduction mechanism in such a channel below the superconducting gap is the so-called Andreev reflection process, in which a quasiparticle current is converted into a supercurrent. However, as de Jong and Beenakker pointed out [  ], for the spin-polarized fraction of the current Andreev reflection is prohibited, thus suppressing the conductance below the gap . The current transfer across an F-S interface can be described by a weak coupling Blonder-Tinkham-Klapwijk (BTK) [  ] type model [  ]. I will discuss the application of this technique to spin polarization measurements, determination of spin-diffusion length, and the studies of dilute magnetic semiconducting oxides [  ].