VPN to all your offices at once
Tailscale is many things, but it's also a VPN. Normal VPNs connect to only one VPN concentrator at a time, which used to make sense, back when there was one office or one datacenter you might want to connect to.
In today's world, devices and services are scattered all around the Internet, in multiple offices, datacenters, and cloud providers. Tailscale creates an encrypted mesh network that connects to all your server networks at once - directly, not through a relay. This means latency is minimized and security is maximized.
Tailscale allows flexible role-based access control (RBAC) rules for each point-to-point connection. Every user, every machine, has a different view of the network according to their rights. Servers you shouldn't have access to simply disappear.