Which of the following best defines a VPN?

A VPN, or Virtual Private Network, is best defined as a secure tunnel for remote access to a network. This definition captures the essence of what a VPN does: it establishes an encrypted connection over the internet to allow users to securely access a private network from a remote location. This secure tunnel protects data in transit by encrypting it, ensuring that sensitive information remains private and secure from potential threats.

The concept of a secure tunnel highlights the primary purpose of a VPN, which is to provide a private and secure connection, especially useful for remote workers or individuals who need to access corporate networks securely while away from their physical workplaces. By using a VPN, users can safely transmit data over public networks, as the encryption helps prevent unauthorized access.

Other options describe different networking concepts or services but do not accurately represent the key function of a VPN. For example, a physical network allowing local connectivity pertains to traditional LAN setups and does not involve remote secure access. A type of internet connection via telephone lines refers to older connection methods like dial-up and lacks the security and features of a VPN. A service that blocks malicious software describes antivirus or endpoint protection rather than the secure communication function of a VPN.