What is a VPN (virtual private network)?

Instead of sending data directly over the internet, a virtual private network funnels encrypted data between your device and a trusted endpoint such as a corporate network or cloud environment. An intermediary VPN server authenticates you and your device, masks your IP address, and lets you bypass website blocks and firewalls on the internet. This approach helps prevent unauthorized access, eavesdropping, and data tampering.

By definition, a VPN connection is:

• Virtual because no physical cables are involved in the connection process.
• Private because through this connection, no one else can see your data or browsing activity.
• Networked because multiple devices—your computer and the VPN server—work together to maintain an established link.

A VPN depends on three key technologies:

Encryption

Encryption converts readable data into an unreadable format known as ciphertext. VPNs rely on strong cryptographic algorithms so that even if data is intercepted, it can’t be understood without the proper keys. This protects sensitive information such as credentials, intellectual property, and internal communications while they’re in transit.

Tunneling

Tunneling is the process of encapsulating encrypted data inside another network packet so it can travel safely across the internet. The tunnel acts as a private pathway between the user and the destination network. VPN tunneling helps shield traffic from interception, especially on unsecured networks such as a public wireless network, where unencrypted traffic can otherwise be observed or intercepted.

Authentication

Before a tunnel is established, VPNs authenticate users or devices to confirm they’re allowed to connect. This step ensures that only approved endpoints gain access to internal systems or cloud resources. Together, encryption, tunneling, and authentication form the foundation of how a virtual private network works.

VPNs often work alongside other technologies such as big data, AI, and machine learning to support secure, scalable digital systems.

Virtual private networks offer several advantages for individuals and organizations, especially as workforces and applications become more distributed. Here are some of the key benefits:

• Enhanced privacy and security: By encrypting traffic and masking IP addresses, VPNs help protect user privacy and reduce exposure on public or shared networks. This is especially important when accessing sensitive systems outside a trusted corporate environment.
• Greater protection for remote and hybrid workers: Flexible work models depend on providing users with secure access to internal systems. VPNs allow employees, developers, and students to connect safely to private networks from almost anywhere without exposing those resources directly to the internet.
• Seamless customer experiences: Users feel as though their devices are directly connected to a private network, even though they may be working from home, a coffee shop, or airport.
• Safer access to cloud resources: As organizations increasingly adopt cloud platforms such as Microsoft Azure, VPNs help bridge on-premises environments with cloud services. Secure, cloud-based services such as VPN Gateway provide encrypted connectivity between on-premises data centers and Azure virtual networks.
• Improved compliance and reduced risk: Many regulatory and industry frameworks require safeguards for data in transit. VPNs support these requirements by helping protect sensitive information as it moves between users, networks, and cloud services. They also support distributed teams while allowing organizations to maintain centralized controls.

VPNs are used across industries and environments, including in the following scenarios:

• Remote work: Organizations use VPNs to give remote employees and contractors access to internal applications, development environments, and data without making those systems publicly accessible. Employees can safely connect to corporate networks from home or while traveling, maintaining productivity without compromising security.
• Site-to-site connectivity: A site-to-site VPN connects multiple office locations—such as branch offices or data centers—over the internet. This allows organizations to link locations securely without relying on expensive private circuits.
• Hybrid and multicloud environments: By enabling secure connections between on-premises infrastructure and cloud services, VPNs can support hybrid, multicloud workloads and gradual cloud migration.
• Developer environments: Developers frequently use VPNs to build, test, and maintain cloud-based apps and other solutions. This includes solutions with cognitive services that require secure, encrypted, and private network access to AI APIs.
• Student and learning environments: Many universities and schools rely on VPNs to give students off-campus access to internal systems such as learning management platforms, digital libraries, research databases, and lab environments.

While virtual private networks remain widely used, newer security models and technologies are evolving to complement or replace them. Here are a few key trends to watch:

Alignment with Zero Trust networking

Rather than relying solely on network location, Zero Trust architectures verify every user and device before granting access. VPNs are often combined with identity-based and conditional access controls to align with Zero Trust principles.

Greater focus on VPN alternatives

Secure access service edge (SASE) architectures, which combine networking and security in a single cloud-delivered service, are emerging alongside VPNs to support more granular access control.

Also, the Software-Defined Perimeter (SDP) framework, a security architecture developed by the Cloud Security Alliance, allows organizations to create an invisible, identity-based network perimeter that follows Zero Trust principles.

Integration with cloud-native security models

As applications move to cloud-based platforms, networking and security tools are becoming more tightly integrated. VPN services in the cloud are being designed to work alongside cloud-based security tools, such as monitoring, analytics, and threat detection systems that use deep learning technologies.

Virtual private networks play an important role in modern networking by helping secure data in transit, supporting remote access, and connecting on-premises environments with the cloud.

While security strategies and technologies continue to evolve, VPNs—especially cloud-based options such as VPN Gateway—remain a common, practical way to protect network traffic while maintaining consistent user access across environments.