A site-to-site VPN establishes secure communication channels between geographically distant offices and networks, enabling seamless data exchange over the internet. It connects multiple sites within an organization or different organizations, facilitating secure data transfer while maintaining a unified network infrastructure. The technology functions like a virtual bridge, securely extending a private network across a public one through tunneling protocols that encapsulate and encrypt data. Site-to-site VPNs provide benefits such as enhanced data security, global network connectivity, scalability, cost-efficiency, and resource optimization, but also pose risks including potential encryption overhead, single point of failure, security vulnerabilities, complex configuration, limited anonymity, and the need for adequate expertise in implementation.