Reaction for the dawn of the net?

Before a message is received by the recipient,it has to go through a lot of processes. The UDP packet or the Universal Datagram Protocol , TCP packet or the Transmission Control Protocol packet and, ICMP packet or the internet Control Message Protocol are the protocols in which messages are divided into packets before they are sent. Every packet contains the IP address of the sender, IP address of the receiver and the message from the sender. The router guides the packets where to go. Some packets are rejected when they do not contain the required information. The firewall filters the packets coming from the web server. As the message is received by the recipient, the packets are recycled and are used again when the receiver responds to the message he/she received. These are the information that I got from the recap of our instructor but I still have something in my mind, I just don't know how to express it and I don't know the term! If only I wasn't sleepy, I would have had a better understanding of the video, then again the video was great and it's very educational especially to those who want to know what happens and how things work in the network.