The 5 main branches of cybersecurity include critical infrastructure security, network security, application security, cloud security, and IoT security (Internet of Things). Cybersecurity is part of the larger system of IT fields. These different branches of cybersecurity are important for companies to cover. These fields protect businesses, as much as possible, against different forms of cyber security attacks. Specializing in one of these 5 fields likewise gives you a better chance of finding a job, depending on your current needs.