Cybersecurity is the practice of safeguarding computers, networks, and data from cyber threats like hacking, malware, and unauthorized access. It involves protecting digital assets through various means, such as network security, information security, and application security. Key aspects include managing user access, ensuring data integrity, and responding to incidents swiftly. Cybersecurity is crucial for protecting sensitive information and maintaining trust in digital systems, as it helps prevent financial losses, data breaches, and reputational damage.