Which concept primarily deals with harmful software?

The concept that primarily deals with harmful software is malware. Malware is a broad term used to describe any software intentionally designed to cause damage to a computer, server, client, or computer network. This includes a variety of harmful software types such as viruses, worms, Trojan horses, ransomware, and spyware.

Understanding malware is crucial in the realm of informatics and cybersecurity because it encompasses various techniques and methods that attackers use to exploit vulnerabilities in software and systems. The impact of malware can range from minor annoyances to major disruptions, such as data loss, theft of sensitive information, or even complete system failures.

The other options represent different areas that, while important in the context of technology and cybersecurity, do not specifically center on harmful software. For instance, cloud computing focuses on the delivery of computing services over the internet, router management pertains to managing devices that direct network traffic, and data privacy refers to the protection of personal data and ensuring individuals' information is handled securely. These areas support overall security measures but do not directly address the threats and implications associated with harmful software like malware does.