Raku is a type of Japanese pottery that is characterized by its low-firing process and the use of special glazes. It was developed in the 16th century by a potter named Chojiro, and is known for its simple shapes and bold colors. The firing process involves removing the pieces from the kiln while they are still hot, which gives them their unique crackled glaze. Raku is often used in tea ceremonies and is highly prized for its rustic beauty.