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
ISP	Internet Service Provider
NAT	Network Address Translation
SSH	Secure Shell for remote terminal access
TLS	Transport Layer Security, supersedes SSL
VPN	Virtual Private Network
VPS	Virtual Private Server (opposed to shared hosting)

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