Networking startup Tailscale has raised $160 million in funding, valuing the company at $1.5 billion.Tailscale develops a virtual private network (VPN) platform that allows customers to establish secure encrypted connections between remote systems.The company's approach eliminates the need for a VPN gateway, resulting in lower latency and improved network performance.Tailscale plans to use the funding to expand its engineering and product teams and invest in the free version of its platform.