Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:

Fewer Letters	More Letters
DNS	Domain Name Service/System
PiHole	Network-wide ad-blocker (DNS sinkhole)
VPS	Virtual Private Server (opposed to shared hosting)
XMPP	Extensible Messaging and Presence Protocol (‘Jabber’) for open instant messaging

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