The first widely recognized computer virus is Brain, created in 1986. Originally developed in Pakistan, Brain infected floppy disks and displayed a message to inform users of its presence. Although it was not malicious in nature, Brain marked the beginning of a new era in cybersecurity, as it demonstrated how software could spread without user consent. Its emergence highlighted vulnerabilities in computer systems and motivated the development of antivirus software and security measures aimed at preventing similar threats in the future.