Computer system security refers to the protection of computer systems and networks from unauthorized access, data breaches, cyberattacks, and other threats that could compromise confidentiality, integrity, and availability. It involves implementing measures such as encryption, firewalls, antivirus software, multi-factor authentication, and intrusion detection systems to safeguard sensitive information. Security practices also include regular updates, vulnerability assessments, and user awareness training to mitigate risks. With the increasing reliance on digital systems, cybersecurity is essential for protecting personal data, business operations, and critical infrastructure from cyber threats like malware, phishing, and hacking attempts.