Computer security refers to the protection of computer systems and networks from theft, damage, or unauthorized access. It involves implementing measures to safeguard sensitive information, such as personal data and financial records, from cyber threats like viruses, malware, and hackers. To ensure computer security, individuals and organizations use various tools and practices, including firewalls, antivirus software, and strong passwords. Regular updates and security patches are also essential to defend against vulnerabilities. By maintaining robust security protocols, users can help protect their devices and data from potential risks.