Tailscale is a secure connectivity platform built on WireGuard that creates encrypted peer-to-peer mesh networks (called "tailnets") between devices, users, and infrastructure. It operates as a zero trust, identity-based networking solution, allowing organizations to connect remote teams, multi-cloud environments, CI/CD pipelines, edge and IoT devices, and AI workloads without traditional VPN infrastructure. Core functionality includes direct device-to-device connections using WireGuard encryption, NAT traversal to establish connections through firewalls and NAT without requiring open inbound ports, and MagicDNS for automatic private DNS resolution across the network. Tailscale supports access control policies based on identity and least-privilege principles, replacing legacy VPN appliances, SASE solutions, and privileged access management (PAM) tools. It enables infrastructure access without requiring bastion hosts or jump servers, and supports Kubernetes cluster connectivity. The platform is available across multiple operating systems and devices, and offers a free tier alongside commercial plans for businesses and enterprises. It is used for use cases including business VPN replacement, CI/CD pipeline connectivity, multi-cloud networking, zero trust network access, infrastructure access, and securing AI workloads.