the.com/protocol stack

means The layered set of networking protocols (like physical, internet, transport, application) where each layer wraps data with its own metadata and hands it to the next, so a single message passes through multiple rule-bound 'offices' to get delivered.

from From Greek 'protokollon,' the first sheet glued to a papyrus roll noting its contents — basically an ancient cover sheet — which came to mean the formal rules of a document or ceremony, then diplomatic etiquette. 'Stack' arrives separately from computer science, where data piles up and gets handled last-in-first-out. Networking engineers in the later 20th century fused the two: protocols for how machines should politely address each other, stacked in layers like nested envelopes, each one you open revealing another sealed one inside.