What is Cyber Security?
Cybersecurity is the practice of protecting systems, networks, and programs from digital attacks. These cyberattacks are usually aimed at accessing, changing, or destroying sensitive information; extorting money from users; or interrupting normal business processes.
Cisco explains: How Cybersecurity Works? and Types of Threats
https://www.cisco.com/c/en/us/products/security/what-is-cybersecurity.html