Packet switching allows users to send large and small chunks of data across the Internet concurrently. That is what computers A and B (servers) are doing in order to send data to computers C and D (clients). In order for the packet switching to work the transmission control protocol (TCP) has to break the info into data packets and manage them when they transfer from computer to computer. The internet protocol (IP) defines how a data packet must be formed and to where a router (connects two or more individual networks) must forward each packet. Each packet will then conform to the IP specification. When it conforms it is known as an IP datagram. Each datagram has its own unique IP address which makes the routing and delivery to and from a computer possible.
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