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A virtual private network (VPN) is a logical network built over existing physical networks. It creates a protected way for computers, networks, or other devices to communicate across infrastructure they already use, such as the internet. The exact protection depends on the VPN’s technology and configuration.

What does “virtual private network” mean?

NIST defines a VPN as a virtual network built on existing physical networks that can provide secure communications between networks or between different nodes on the same network. In practical terms, a VPN carries selected network traffic through a protected connection over an underlying network. It is “virtual” because it is created through software and network controls rather than a separate set of physical cables. NIST’s glossary definition and its Guide to IPsec VPNs (Special Publication 800-77 Rev. 1, published June 30, 2020) describe this general idea.

People often call the protected connection a “tunnel.” The metaphor describes how traffic is carried through the underlying network; it does not mean that every connection or all device traffic is automatically protected. What travels through the VPN depends on its design and configuration.

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What can a VPN protect?

Depending on the technology and settings, a VPN can help provide confidentiality, integrity, authentication of a communication’s origin, replay protection, and access control. For example, IPsec VPNs can use encryption to protect confidentiality, message authentication to help detect changes, key exchange, and peer authentication. Which protections are enabled—and how they are implemented—matters. NIST’s IPsec guidance explains these mechanisms.

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A VPN can reduce risks when data crosses an insecure network, but it is not a guarantee of anonymity or total security. It cannot make a compromised device safe: spyware or a virus on either endpoint may capture passwords or other information before it is protected for transmission. Software or algorithm flaws can also undermine a VPN’s protections. NIST discusses these limits in its telecommuting and broadband security guidance.

What are VPNs used for?

VPNs can connect different kinds of endpoints, depending on which devices need to communicate and what resources they need to reach:

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  • Remote access: A remote worker’s device connects to an organization’s network or servers through a VPN.
  • Network-to-network: VPN gateways connect separate networks so they can communicate over an underlying network.
  • Host-to-host: A VPN protects communication between particular devices or hosts.

These are deployment models, not guarantees about the scope of protection. In any setup, the devices involved, traffic routed through the connection, authentication, and access controls determine what the VPN actually covers. NIST’s IPsec VPN guide describes these use cases.

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What does a consumer VPN app do?

A consumer VPN app is one way to establish a VPN connection from a device. The label alone does not tell you what traffic the app routes, what protections it enables, or how the provider handles information. Before installing one, the FTC recommends researching the app, reviewing its requested permissions, checking that it encrypts information, and finding out whether it shares information with third parties. Those checks are useful questions, not proof that an app or provider is trustworthy. See the FTC’s VPN app guidance.

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