The important categories of solid waste are

The important categories of solid waste are Municipal wastes, Industrial wastes and Hazardous wastes.
A solid waste is defined as any discarded material that is abandoned by being disposed of, burned or incinerated, recycled or considered "waste-like.
It is the unwanted or useless solid materials generated from human activities in residential, industrial or commercial areas. It may be categorized in three ways. According to its origin as domestic, industrial, commercial, construction or institutional.