"A VPN, which stands for virtual private network, is a technique used to secure the network and create an encrypted connection between clients and servers. This can be done using either software or hardware. The VPN acts as an intermediary between the client and the server. The client's data is first sent to the VPN, where it is encrypted, and all the client information is masked. The data is then sent to the server. When the server responds, the process is repeated but in reverse."

This is a standard format for a technical question during an interview. It first asks you to define a concept used in your profession and then discuss how it is used. During an interview, you should pay special attention to how questions are asked. This will enable you to properly answer the question and each of its parts. Make sure you listen attentively to the entire question before you begin to formulate your answer.