What purpose does a Virtual Private Network (VPN) serve?

A Virtual Private Network (VPN) primarily functions to create a secure communication channel over a less secure network, such as the internet. It does this by encrypting data transmitted between the user's device and the VPN server, ensuring that sensitive information remains confidential and protected from unauthorized access. This security is especially important when accessing public Wi-Fi networks, where data can be easily intercepted.

In addition to providing encryption, a VPN can mask the user's IP address, enhancing privacy and allowing users to bypass geo-restrictions on content. This makes it a valuable tool for individuals and organizations seeking secure remote access to networks and resources.

The other options focus on benefits that are not inherently provided by a VPN. For instance, enhancing website speed is not a primary function of a VPN—it often introduces some latency due to encryption and routing. Similarly, a VPN does not multiply internet connection availability, as the connection is still dependent on the user's internet service. Lastly, while a VPN may have implications for data transfer costs (e.g., reducing the risk of bandwidth throttling by ISPs), cost reduction is not the main purpose of a VPN, which is fundamentally about security and privacy.