A VPN, or Virtual Private Network, primarily serves to create a secure and encrypted tunnel for data transmission over the internet. This technology enables users to maintain their privacy and anonymity, particularly when using public Wi-Fi networks. Additionally, VPNs are often utilized to bypass geo-restrictions, granting access to content that may be blocked in specific regions. By masking the user's IP address, a VPN adds an extra layer of security, protecting sensitive information from potential threats.