In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall. This technique is most commonly used to make services on a host residing on a protected or masqueraded (internal) network available to hosts on the opposite side of the gateway (external network), by remapping the destination IP address and port number of the communication to an internal host
Explanation:you will have to turn on your WiFi or hotspots on your smart phone and allow your friend to also turn his WiFi or hotspot after you will search for your WiFi and connect there he can use the internet
