What is a virus?
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A computer virus is a malicious piece of executable code that propagates typically by attaching itself to a host document that will generally be an executable file[In the context of talking about viruses, the word “host” means a document or a file. A “host” is typically a digital device capable of communicating with other devices. Even more specifically, in the context of networking protocols, a host is whatever is identified by a network address, like the IP address].
Viruses are microscopic organisms that can infect hosts, like humans, plants or animals. They’re a small piece of genetic information (DNA or RNA) inside of a protective shell (capsid). Some viruses also have an envelope. Viruses can’t reproduce without a host.