Network Security Services are used to protect a network's infrastructure, data, and users from unauthorized access, attacks, and other threats. These services prevent data breaches, ensure the availability and integrity of critical systems, comply with regulations like GDPR and HIPAA, and build customer trust by safeguarding sensitive information and maintaining business reputation. Key uses include implementing firewalls, VPNs, anti-malware solutions, user authentication, and monitoring network traffic for intrusions.