Abstract
A brief introduction is provided to the origin of interstellar polarization, grain model calculations, and alignment. The characteristics of the observed linear and circular continuum polarization are described, with an emphasis on various constraints that might be placed on the nature of the polarizing grains and what additional observations would be of value. Complementary information can be obtained from polarization structure at spectral features in the extinction curve. Interstellar polarization has been measured in some other galaxies, indicating an interesting frontier for further research.
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