Raku ware is a traditional Japanese pottery, primarily known for its use in tea ceremonies with teacups and tea utensils. It developed in the 16th century under the influence of the tea master Sen no Rikyū. The key features of Raku ware are its simple, rustic shapes and the natural, unrefined glazes that give it a warm, earthy appearance. The firing process often creates unique cracks and color variations, which are part of its charm. Raku tea bowls are particularly prized in the tea ceremony for their distinct and inviting character.