Sea debris is composed of two distinct categories: FLOTSAM and JETSAM. FLOTSAM is debris that has been discarded, abandoned, or lost at sea, while JETSAM is debris that has been deliberately thrown overboard. FLOTSAM is typically found floating on the surface of the water, while JETSAM is usually found on the ocean floor. Both terms are commonly used to refer to any type of debris found in the ocean, including plastic, wood, metal, and other materials.