Viruses are classified neither as non living nor as living. It is non living as it doesn't have any metabolic process of its own. How does a virus reach a host cell if it does not undergo any metabolic processes?

Viruses are non motile and cannot metabolise, and that it enters the host cells via binding to the receptors. The mechanism is as follows:

 

The viruses are made mostly of protein and genetic material. They search for a cell that is expressing a protein so that they can jerk into that particular cell with which the virus can bind to and initiate viral entry.