Cyber security is the practice of defending computers, networks, and data from malicious electronic attacks. It is often contrasted with physical security, which focuses on controlling access to real-world objects and buildings.

The importance of cybersecurity cannot be overstated. In the digital age, a single security breach can have devastating consequences for businesses and individuals, from financial loss to a drop in reputation. For example, the 2017 Equifax and 2018 Marriott breaches compromised personal information for 145 million and 500 million people, respectively.

To prevent such occurrences, organizations must invest in cyber security measures such as firewalls and encryption. These tools help protect against malware, ransomware, phishing, spam, spyware, and other online threats. They also help improve productivity by preventing downtime and protecting sensitive information.

A career in cybersecurity requires a wide range of skills, including problem-solving, critical thinking, communication, and teamwork. You must also be willing to stay up-to-date on new threats and best practices, as attackers constantly develop new methods to steal or damage data. For example, a malicious hacker might add a logic bomb to a legitimate program so that it triggers when accessed, or create a microkernel to bypass standard operating system security features like disk encryption and Trusted Platform Module. Attackers can also gain direct access to a computer by installing key loggers and covert listening devices.

As the world becomes more and more dependent on technology, the need for skilled professionals in this field will only continue to grow. There are several paths to a career in cybersecurity, including formal education, self-study, and internships. Additionally, many universities now offer specialized degrees in this area. MDR