are viruses living things?if yes then which kingdom do they belong?

Viruses do not belong to a kingdom of living things.

Viruses must have a host cell to live and reproduce. Outside of the host cell, viruses are pieces of genetic molecules that can do nothing by themselves. Viruses are right on the border between living and nonliving. Some biologists currently see the virus as a nonliving infectious particle. Other biologists disagree and suggest they are alive because of what happens inside the host cell. Whether viruses are living or not is still an open-ended question.