Waste refers generally to any material that is disposed of or discarded, encompassing both solid matter and various chemical effluents. Scientifically, the study of waste material involves understanding its composition, generation sources, and the subsequent environmental and resource implications. Waste management fields apply diverse technologies, ranging from mechanical processes like sorting and compaction to chemical treatments such as incineration and biological decomposition. Depending on its origin—whether metabolic, industrial, or municipal—waste must be classified to determine the appropriate disposal or recovery pathway. Modern waste science emphasizes resource recovery, aiming to mitigate environmental contamination while extracting valuable materials, including energy sources and raw components, from discarded matter.