When an application wants to send or receive traffic, it has to use a numbered port between 1 to 65535. This is how you can have multiple applications on a computer using the network and each application knows which traffic is for it.
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USB port
An interface used for connecting a Universal Serial Bus (USB) device to computer; these ports support plug and play.
Serial port
An interface on a computer that supports transmission of a single bit at a time; can be used for connecting almost any type of external device including a mouse, a modem, or a printer.
Flash drive
A small device that plugs into computer’s USB port and functions as a portable hard drive.
Male Connector
A cable connector that has pins and plugs into a port or interface to connect one device to another.
Firewall
A firewall is a piece of software or hardware that blocks certain types of traffic. For example, a firewall could block incoming traffic on a certain port or block all incoming traffic except traffic coming from a specific IP address.