Why are viruses called obligate intracellular parasites?

The viruses are connecting link between living and non-living. They are unable to perform life process outside the living cells. Outside living cells, the viruses behave as simple chemicals. So, they are called as obligate intracellular parasite''. Thank you

As infectious entities, viruses are made up primarily of nucleic acid and proteins. They are acellular, non-living when outside of their host, but become living when inside the host by utilizing the metabolic processes of the host cell. As a result, they are classified as either living or non-living particles, which is why they are also known as intracellular obligate parasites.

Because viruses lack the cellular machinery required for independent metabolism and reproduction, they are known as obligate intracellular parasites because they can only replicate inside the host cells of other organisms. As a result, they are completely dependent on the resources and machinery of their host cells in order to replicate and generate new viral particles.