You can connect to your Raspberry Pi from another computer anywhere in the world over the Internet. One method is to use port forwarding. Port forwarding requires you to change the configuration settings on your router. You must configure your router to forward the Internet traffic delivered to your public IP address on a specific TCP port number, to automatically route to the local network IP address of your Raspberry Pi. Most routers have this feature available through their configuration webpage. However, every router is different and there is no single set of instructions that applies to every router in use today. You will need to refer to the instruction manual for your router. The configurations can be tricky if your Pi is behind a firewall, or behind more than one router. One disadvantage of port forwarding is that it leaves a TCP port on your public IP address open on the Internet. This is a well known security vulnerability and must be managed carefully.