System security refers to the measures and protocols put in place to protect computer systems and networks from unauthorized access, damage, or theft. It involves the use of software, hardware, and policies to safeguard sensitive information and ensure the integrity of data. Key components include firewalls, antivirus programs, and encryption techniques. Effective system security also encompasses user authentication and access controls, which help ensure that only authorized individuals can access certain data or systems. Regular updates and patches are essential to address vulnerabilities and protect against emerging threats, such as malware and cyberattacks.