Also known as organic waste or biodegradable waste, wet waste primarily consists of materials that are easily decomposable by natural processes. This includes kitchen waste such as food scraps, vegetable and fruit peels, leftovers, tea bags, coffee grounds, and similar organic materials. Wet waste also includes yard waste like grass clippings, leaves, and twigs. Wet waste can be broken down by microorganisms through composting or anaerobic digestion processes to produce compost or biogas.

Dry waste refers to non-biodegradable waste materials that do not decompose easily. This category includes items like paper, cardboard, plastics (such as bottles, containers, and packaging materials), metals (like aluminum cans and foil), glass, textiles, rubber, and certain types of wood. Dry waste can often be recycled or repurposed through various processes such as sorting, shredding, melting, or reusing. Recycling dry waste helps conserve resources, reduce energy consumption, and minimize environmental impact by diverting waste from landfills.

E-waste refers to discarded electronic devices and equipment, both functional and non-functional. This includes items such as computers, laptops, smartphones, tablets, televisions, refrigerators, washing machines, printers, and other electronic gadgets. E-waste may contain hazardous materials such as lead, mercury, cadmium, and brominated flame retardants, which can pose risks to human health and the environment if not handled properly. Improper disposal of e-waste can lead to contamination of soil, water, and air.

Biomedical waste, also known as healthcare waste or medical waste, refers to waste generated during the diagnosis, treatment, or immunization of humans or animals, as well as research activities related to biological materials. This includes materials such as used needles, syringes, lancets, surgical instruments, gloves, bandages, cultures, blood and bodily fluids, pharmaceuticals, and laboratory chemicals.