Cybersecurity has evolved significantly over time. Early computer systems in the 1960s and 1970s had little security, relying primarily on physical isolation. Through the 1980s and 1990s, the rise of networks and the internet led to new vulnerabilities and threats, requiring authentication, encryption, firewalls, and antivirus software. Modern cybersecurity continues to advance with innovations like machine learning, blockchain, and a greater focus on the human element of security awareness and training.