A port enables your operating system to establish a connection with other servers. For instance, AIM chat uses port 4443, games such as “World of Warcraft” use port 3724 and port 25 is the default port to send and receive emails. There are two types of protocols a port can use; the TCP protocol enables you to exchange streams of data through the port and the UDP protocol sends data over an IP network. If a website you want to access uses a port blocked by your firewall, you’ll need to add this port to the firewall’s exceptions list to unblock it. Writer Bio
