Network security refers to the practice of protecting computer networks and data from unauthorized access, cyberattacks, and disruptions. It involves implementing policies, tools, and technologies such as firewalls, encryption, intrusion detection systems, and access controls to ensure confidentiality, integrity, and availability of data. With the rise of cyber threats, organizations must continuously monitor and strengthen their network security to prevent breaches, safeguard sensitive information, and maintain smooth operations. Effective network security is essential for protecting businesses, governments, and individuals in an increasingly digital world.