What is a living cell in which a virus can actively reproduce or in which a virus can hide until activated by environmental stimuli?

A living cell in which a virus can actively reproduce is known as a "host cell." Viruses rely on host cells to replicate, as they lack the cellular machinery necessary for reproduction. Additionally, some viruses can enter a dormant state within host cells, known as a "provirus" or "latent infection," where they can remain hidden until triggered by environmental stimuli to become active and replicate.