Western Raku Pottery is made from a low fire process inspired from the traditional Japanese Raku. It involves removing the pottery from  kiln at approximately 1800 degrees Fahrenheit. The pots are placed in a combustion chamber where combustible items ignite. While the pottery is in the combustion chamber the fire works it's magic. 
Horse Hair Pottery is removed from the kiln at around 1400 degrees Fahrenheit and the potter places strands of horse hair on the pot. The Horse hair burns beautiful patterns into the pottery. 
Horse Hair and Raku Pottery is generally only used for decorative purposes.