Solid waste, a byproduct of human activities and natural processes, poses significant challenges to environmental management due to its volume, diversity, and potential hazards. In the context of environmental biotechnology, understanding the sources, classification, and biodegradation of solid waste is crucial for developing sustainable strategies to mitigate its environmental impact. Solid waste can originate from multiple sectors and its composition can vary widely, influencing the selection of appropriate treatment and management technologies. The sources of solid waste are broadly categorized into municipal, industrial, agricultural, and biomedical origins. Municipal solid waste (MSW) primarily arises from household, commercial, and institutional activities. It includes organic waste such as food scraps and yard trimmings, inorganic materials such as plastics, metals, and glass, and other miscellaneous materials like textiles and paper. Industrial solid waste originates from manufacturing processes and varies depending on the type of industry, encompassing chemical sludges, metal residues, and byproducts of industrial processes. Agricultural waste consists of crop residues, animal manure, and agro-industrial byproducts, which may contain pesticides, herbicides, or other chemicals. Biomedical and healthcare waste, generated from hospitals and clinics, includes sharps, infectious materials, pharmaceuticals, and chemical residues, posing high health and environmental risks. Other specialized sources include e-waste from electronic devices, construction and demolition debris, and mining waste, each with distinct chemical and physical properties that influence their environmental behavior. Classification of solid waste is essential for its effective management and is often based on hazardous potential, content, and origin. Hazardous waste is defined by its ability to cause substantial threats to human health or the environment. These wastes exhibit characteristics such as ignitability, corrosivity, reactivity,