What is a VPN used for?

A Virtual Private Network (VPN) is primarily used to create a secure and private network connection over the internet. This is achieved by encrypting the data that travels between the user's device and the VPN server, which helps protect sensitive information from potential threats, such as hackers or eavesdroppers. By using a VPN, users can connect to the internet as if they were on a secure private network, enabling them to access restricted resources, maintain privacy, and enhance security while working remotely or using public networks.

The other options may touch upon related functionalities but do not encapsulate the primary purpose of a VPN. While connecting multiple offices may be a function of a VPN setup in certain business contexts, the overall essence of a VPN's usage lies in securing data transmission and ensuring privacy. Similarly, managing network traffic and increasing network speed are not fundamental uses of a VPN, as the primary focus rests on establishing secure connections rather than enhancing general network performance or traffic management.