Cybersecurity is the practice of protecting systems, networks, and data from cyber threats such as hacking, malware, phishing, and ransomware. It ensures the confidentiality, integrity, and availability of information by using tools and strategies like firewalls, encryption, and multi-factor authentication. Key areas include network security, cloud security, and endpoint protection. As technology evolves, strong cybersecurity is essential for individuals and organizations to stay safe in the digital world.