Jessica McKellar’s excellent How The Internet Works presentation:
Notes You type http://python.org into your browser bar and press Enter. What happens?
Questions WHAT is python.org?
WHERE is python.org?
HOW does my computer talk to python.org?
WHAT does my computer SAY to python.org? Protocol A format and rules for exchanging information. Internet protocols are layered, one protocol per task. Application-layer protocols that use TCP: