Direct answer

If you’re evaluating VPN use on public Wi‑Fi for remote work, focus on the operating model (what the VPN actually changes), the key limitation (what it does not guarantee), and practical verification steps you can repeat before trusting it for work.

What it means (definitions and operating conditions)

A VPN typically routes your device’s traffic through a protected tunnel to a VPN endpoint, so local network observers on the same Wi‑Fi see less of your content. On public Wi‑Fi, the main goal is reducing exposure of in-transit data between your device and the VPN endpoint.

In practice, results depend on conditions outside the VPN itself: the Wi‑Fi network quality, captive portals, device configurations, OS/browser settings, DNS behavior, and the availability of the VPN endpoint. For remote teams, also consider how many devices join the network, whether users are on managed endpoints, and how quickly issues must be diagnosed.

How it works (simple model)

Conceptually, you have four layers to think about:

  1. Your device network connection to the public Wi‑Fi.
  2. The VPN tunnel from your device to the VPN endpoint.
  3. Routing inside the VPN session (which traffic goes where).
  4. Application behavior (browsers, email, remote desktop tools).

Common “gotchas” include split routing (some traffic bypasses the tunnel), DNS resolution happening outside the tunnel, and application features that can use separate connections.

Parts you should evaluate

  • Connection establishment: Can the VPN reliably connect on the Wi‑Fi type you expect (including networks with login/captive portals)?
  • Traffic coverage: Does the VPN cover the traffic you care about (web, email, remote desktop), or only some apps?
  • Failure handling: Does it block or limit traffic if the VPN drops, so you don’t silently revert to direct Wi‑Fi access?
  • Usability for teams: Can each role/device set consistent settings (especially on managed work devices)?
  • Operational visibility: Do you have enough logging or status indicators to confirm the tunnel is actually active?

For remote work, also treat endpoint security as prerequisite work: patching, strong account authentication, and cautious handling of session tokens.