The primary use of a virtual private network (VPN) is to provide a secure, encrypted connection between a user's device and the internet. VPNs protect user privacy by masking IP addresses and encrypting data, making it more challenging for hackers or unauthorized parties to intercept sensitive information. Additionally, VPNs enable users to bypass geographical restrictions, access blocked content, and maintain secure internet connections while using public Wi-Fi networks, ultimately enhancing online security and freedom.