How does a VPN enhance online security?

A VPN, or Virtual Private Network, enhances online security primarily by encrypting the connection to a private network. This encryption creates a secure tunnel through which data is transmitted, protecting it from potential eavesdroppers and cyber threats. When users connect to the internet via a VPN, their data is encoded, making it unreadable to anyone who may intercept the connection, such as hackers or unauthorized networks.

This process not only safeguards personal and sensitive information, such as login credentials and financial details, but it also masks the user's IP address, helping to maintain privacy and anonymity. As a consequence, even if data were intercepted, it would be nearly impossible for an outsider to decipher or misuse it without the appropriate encryption keys.

The other options do not accurately describe the primary function of a VPN in enhancing online security. While blocking internet traffic might limit exposure to threats, it is not a feature of VPN technology. Downloading data locally and using public networks for data transfer do not inherently contribute to online security, and in fact, can increase vulnerability without the protective measures offered by a VPN.