What Is a VPN?

VPNs help protect data as it travels across networks you don’t fully control, including the public internet. They’re widely used to give remote users secure access to internal resources, connect separate networks, and reduce direct exposure of a user’s originating public IP address in many consumer VPN setups.

Some of the more common reasons to use a VPN include:

• Protecting data in transit: Encryption makes intercepted traffic harder to read.
• Supporting remote work: Employees can connect to company resources from outside the office.
• Connecting locations: Organizations can link offices, data centers, or cloud environments over public networks.
• Improving privacy: A VPN can limit what local network operators or outside observers can see about traffic between the user and the VPN endpoint.

A VPN is one part of a broader network security strategy. It doesn’t secure a compromised device, prevent every type of attack, or guarantee complete anonymity.

How does a VPN work?

A VPN works by creating a protected logical connection, often called a tunnel, between two endpoints. Depending on the VPN type, those endpoints may be a user device and a VPN server, or two gateways connecting separate networks. A typical connection follows this sequence:

1. A device or network initiates a connection to a VPN endpoint.
2. The user or device is authenticated where required.
3. A VPN protocol establishes the tunnel.
4. Traffic is encrypted before it crosses the untrusted network.
5. The VPN endpoint decrypts the traffic and forwards it toward its destination.
6. Return traffic follows the protected path back to the originating side.

Key components of a VPN

Several parts work together to create and maintain the connection:

• VPN client or gateway: Starts the VPN connection from the user or network side.
• VPN server or terminating gateway: Receives the protected traffic and routes it onward.
• VPN protocol: Defines how the tunnel is established and how data moves through it.
• Encryption: Protects data from being read while it travels through the VPN tunnel.
• Authentication: Confirms that a user, device, or system is allowed to connect.
• Routing: Determines where traffic goes after it enters or leaves the tunnel.

What happens to your IP address?

For many internet-facing VPN services, websites and online services see the VPN server’s public IP address instead of the user’s originating public IP address. That can reduce direct exposure of the user’s network location.

This doesn’t make a user invisible, as websites may still identify or track activity through logins, browser data, cookies, device characteristics, or other signals.

What are the main types of VPNs?

VPNs can be grouped by what they connect and who manages the connection. The underlying goal is similar, but the architecture and use cases differ.

Remote-access VPNs

A remote-access VPN connects an individual device to a private network. Employees commonly use this type of VPN to reach internal applications, files, or systems when working outside the office.

The user typically starts the connection through VPN software or an operating system feature, authenticates, and then sends approved traffic through the encrypted tunnel.

Site-to-site VPNs

A site-to-site VPN connects one network to another through VPN gateways. Organizations often use this approach to link branch offices, data centers, or cloud environments over the internet.

Because the gateways maintain the connection, individual users generally don’t need to establish their own VPN sessions.

Personal VPNs

A personal VPN connects a user’s device to a VPN provider’s server before traffic continues to the public internet. This type is commonly associated with privacy, public Wi-Fi protection, and changing the public IP address seen by online services.

These VPN types solve different problems, so the right model depends on whether the goal is connecting a person, connecting networks, or protecting internet-bound traffic.

What are VPNs used for?

VPNs support several different security and networking use cases, with the underlying idea similar in each case: Create a protected connection across a network that isn’t inherently trusted.

Secure remote access

A remote-access VPN allows a user to connect to an organization’s internal network from another location. This is common when employees need access to internal applications, file shares, or administrative systems while working remotely.

Remote access often works alongside identity controls such as multi-factor authentication (MFA). The VPN protects the connection, while authentication helps determine whether the person or device should be allowed to use it.

Site-to-site connectivity

A site-to-site VPN connects entire networks rather than a single user device. For example, an organization might create a VPN between a branch office and a central data center, or between an on-premises environment and cloud infrastructure.

Because the VPN is established between gateways, users on either network may not need to start individual VPN sessions.

Privacy on public networks

A VPN can protect traffic between a device and the VPN endpoint when someone is using an untrusted network, such as public Wi-Fi. This reduces the amount of readable traffic exposed on that local network.

Protection here has boundaries, as once traffic leaves the VPN endpoint, it continues toward its destination using the security provided by the destination service and the protocols in use.

Personal VPN use

Personal VPN services are often used to improve privacy by encrypting traffic to the VPN provider and replacing the user’s visible public IP address with the VPN server’s address.

This can make some forms of local network monitoring or IP-based tracking more difficult, but it doesn’t guarantee anonymity or replace safe browsing, endpoint protection, and account security.

How do VPNs fit into security operations?

VPNs are best understood as a secure connectivity control. They protect a path between endpoints, but security teams still need to decide who gets access, which systems they can reach, and whether the connecting device is trustworthy.

That‘s where VPNs overlap with adjacent security disciplines:

• Identity security helps verify and govern who is requesting access.
• Multi-factor authentication adds another layer of verification before access is granted.
• Network access control (NAC) can enforce policies based on the user, device, or connection.
• Network security applies controls across the broader environment, including segmentation, monitoring, and traffic inspection.

The key distinction is that a VPN secures a connection, but doesn’t automatically determine whether a user, device, or requested resource should be trusted.

Security teams also need visibility into VPN activity. Login patterns, connection attempts, unusual access times, and unexpected source locations can all provide useful context during monitoring and investigation.