Definition
A no-logs policy is a VPN provider's stated commitment not to keep records that could be used to identify a user's activity. Strong no-logs policies cover both connection metadata (when, from where, to which server) and activity (which sites visited, what data transferred). Weaker policies cover only activity, retaining connection data for 'service quality' or billing purposes. The phrase 'zero logs' is often used as a stronger marketing variant but has no standardized technical meaning.
Verification
A claim is only as good as its verification. Three forms of evidence carry weight: independent audits by reputable firms (Deloitte, PwC, Cure53) that examine actual server configurations; real-world legal cases where authorities subpoenaed data and the provider had nothing to hand over; and architectural choices that make logging structurally difficult, such as RAM-only servers and authentication systems that do not link sessions to accounts. A privacy policy alone, without evidence, is just marketing.
What It Cannot Promise
Even a fully audited no-logs policy cannot retroactively cover changes. A provider operating no-logs today can be ordered to start logging tomorrow under a gag order; this is what warrant canaries are designed to detect. No-logs also does not address compromise — if an attacker breaks into the VPN provider's infrastructure, real-time traffic can be observed regardless of policy. The strongest privacy stance combines a no-logs policy, audited architecture, privacy-friendly jurisdiction, and end-to-end encryption at the application layer.