Which of the following describes a virtual private network (VPN)?

A virtual private network (VPN) is accurately described as a secure connection over a public network. This means that it allows users to send and receive data across shared or public networks as if their devices were directly connected to a private network. The primary purpose of a VPN is to enhance security and privacy by encrypting the data being sent or received, thereby protecting it from potential interception by unauthorized parties. This is particularly useful when connected to unsecured networks, such as public Wi-Fi, where data could be vulnerable to eavesdropping.

The distinction of a VPN lies in its ability to create a secure "tunnel" for internet traffic, ensuring that information remains private even when accessing the internet through public infrastructure. This technology is widely used by organisations to protect sensitive data and by individuals seeking to maintain their online privacy.

In contrast, the other options do not correctly define a VPN. A local area network pertains to a network that is limited to a small geographic area, like a home or office. A type of internet service provider is a business that provides individuals or organizations access to the internet, and a method of cloud storage refers to saving data online rather than on a local device. These alternatives do not encompass the core functionality and purpose of a VPN.