Which of the following best describes a computer virus?

A computer virus is best described as a program that reproduces itself and may harm files. This definition captures the essential characteristics of a virus: its ability to replicate and its potential to cause damage to data and systems.

When a computer virus infects a system, it often attaches itself to legitimate programs or files, which allows it to spread to other systems and files, usually without the user's knowledge. The malicious nature of viruses means that they can disrupt operations, corrupt or delete files, and lead to significant security issues. Understanding this definition is crucial because it highlights the importance of cybersecurity measures to prevent, detect, and respond to such threats.

The other options touch on different aspects of technology and cybersecurity but do not accurately define what a computer virus is. For instance, while one mentions internet connectivity issues, this is not a characteristic of viruses; several factors can cause connectivity problems that do not involve malicious software. Another option talks about a tool for defending against malware, which is entirely different from the function of a virus. Lastly, discussing spam emails relates to unsolicited communication rather than the self-replicating and malicious behavior of a virus. Thus, recognizing the key traits of a computer virus helps in understanding broader cybersecurity concepts and risks.