Configuration profiles enable device customization by allowing IT administrators to define settings (e.g., Wi-Fi, VPN, security policies) tailored to organizational needs, deployed via MDM or manually. Personalization (option A) is user-driven, often restricted by profiles. Network performance (option C) is unrelated, and data separation (option D) is a User Enrollment feature. The Apple Platform Deployment Guide emphasizes customization as a key benefit of profiles.