Firewall

A firewall filters traffic by rules; VPN kill switches often rely on firewall rules to prevent leaks when the tunnel drops. In a VPN Surf workflow, combine this concept with strong account security like MFA and a password manager. If a feature sounds vague in marketing, look for measurable signals: audits, documentation, and testable settings. For most people, the biggest privacy win is shielding activity from local network observers and reducing ISP-level profiling. VPN Surf and Elite VPN guidance aims to keep the concept actionable, not just theoretical.