Tunnel Mode is a method used in networking, particularly in Virtual Private Networks (VPNs), to encapsulate data packets. In this mode, the original data is wrapped inside a new packet, which allows it to be securely transmitted over the internet. This encapsulation helps protect the data from being intercepted or tampered with during transit. In Tunnel Mode, the entire original packet, including its header, is encrypted. This means that only the endpoints of the tunnel, such as the VPN server and the client, can read the data. This enhances privacy and security, making it a popular choice for users who want to safeguard their online activities.