It's something to do with how the Internet works. Built on telephone networks, copper wires and all that fancy-pants stuff.

Queuing theory helps telephone networks handle situations where more people can make more calls than there are physical connections.

Packet switching is a digital network communications method that groups all transmitted data into blocks (aka, packets). Packet switching is the fancier version of circuit switching, where there is a physical path between the two nodes (just like an old fashioned phone operator, which moved switches around to connect phone calls).

Packet switching is the delivery of variable bit-rate data streams over a shared network, by traversing network adaptors, switches, routers, etc. Packets are like packets (the mail kind), they have the contents (data), a destination address (the address), and delivery information (or administrative information, such as the packet number).

Packets are sent individually between nodes, taking the route defined by a routing algorithm. Not all packets will necessarily follow the same route. The packets arrive in different orders than they're sent, the destination computer reassembles them into their appropriate sequence.

Protocols are the rules which allow controlled communication, which provide standards for data formats and error handling.

An IP address is like a phone number. IP addresses are referred to by domain names through DNS.

HTTP is a stateless protocol, it doesn't remember anything it did before what it did just now.

And that's about it.