Internet

Query language A query language is a formal notation used to request and manipulate information from databases and information systems, with variants for different data models and user needs.

Randnet: Nintendo 64DD's Online Service Randnet Randnet was Nintendo's online subscription service for the 64DD add-on, available only in Japan. It provided online play, content sharing, and web/email features before being disco…

Really Simple Syndication (RSS): overview, formats, and uses Really Simple Syndication RSS is a family of XML-based web feed formats that deliver frequently updated content—such as news, blog posts, and podcasts—to subscribers via feed readers and aggregators.

Reddit: Community-driven social news and discussion platform Reddit Reddit is a community-based website built from user-submitted links, posts and conversations organized into topic-specific forums called subreddits. It features voting, moderation…

Regional Internet Registry Organizations that allocate and register IP address blocks, autonomous system numbers and related resources within defined geographic regions, operating through community policy an…

Registered user (online accounts and roles) Registered user Overview of registered users: what registration means, common account features, uses across websites and programs, historical context, and privacy and usability considerations.

Reverse DNS lookup (rDNS): PTR records, reverse zones, and common uses Reverse DNS lookup Reverse DNS lookup maps an IP address to a hostname using PTR records in reverse DNS zones (.in-addr.arpa, .ip6.arpa). Used for mail checks, logging, and troubleshooting; delegatio…

Rickrolling: the bait-and-switch internet meme centered on Rick Astley's song Rickrolling Rickrolling is a bait-and-switch prank that sends someone unexpectedly to Rick Astley’s 1987 song “Never Gonna Give You Up.” The meme began on imageboards and became a long-lived i…

rlogin — the original Unix remote login protocol rlogin rlogin is a legacy Unix remote-login program and protocol (TCP port 513) that enabled interactive access to remote hosts; now deprecated because it lacks encryption and robust auth…

Romanian Wikipedia (Wikipedia în limba română) Romanian Wikipedia The Romanian-language edition of Wikipedia, launched in June 2003. A community-maintained online encyclopedia focused on Romanian-language subjects, culture, language and general k…

Rotten Tomatoes — review aggregator for film and television Rotten Tomatoes Rotten Tomatoes is a review-aggregation website for film and television, known for the Tomatometer and 'Certified Fresh' labels; it collects critics' and audience responses and pub…

Russian Wikipedia (Русская Википедия) Russian Wikipedia The Russian-language edition of Wikipedia, launched in May 2001. A large, volunteer-built online encyclopedia serving Russian speakers worldwide with broad topical coverage and com…

Sabayon Linux A Gentoo-based rolling-release distribution that provides precompiled binary packages via Entropy while remaining compatible with Gentoo's Portage and offering live media and multi…

Safari (web browser) Safari is Apple’s web browser, built on the WebKit engine. Default on macOS and iOS, it emphasizes performance, energy efficiency and privacy and integrates closely with Apple serv…

Sanskrit Wikipedia (संस्कृतविकिपीडिया) Sanskrit Wikipedia The Sanskrit-language edition of Wikipedia, launched December 2003, offering articles in Sanskrit to support language preservation, study, and public access to knowledge.

ScienceWorld (Eric Weisstein's World of Science) ScienceWorld A comprehensive online science encyclopedia curated by Eric Weisstein and hosted by Wolfram Research, covering astronomy, chemistry, physics, biographies and related scientific top…

Scots Wikipedia The Scots-language edition of Wikipedia, created in 2005. A community-run online encyclopedia in the Scots language that has been used for education, cultural preservation and subj…

Screenonline — British film and television reference from the BFI Screenonline Screenonline is an online reference created by the British Film Institute that documents the history and social context of British film and television, with essays, programme entri…

SeaMonkey — Integrated Internet Application Suite SeaMonkey SeaMonkey is a free, open-source integrated Internet application suite featuring a browser, e-mail, calendar, HTML editor and IRC client, developed and maintained by a community co…

Search engine: definition, components, history, uses and varieties Search engine An overview of search engines: what they are, how they work, core components, history, common types, practical uses, monetization, privacy and technical challenges.

Search engine optimization (SEO): overview, methods, and history Search engine optimization Search engine optimization (SEO) is the practice of improving a website's visibility in search engine results through content, technical improvements, and links to increase relevan…

Second Life: a persistent, user-created virtual world and platform Second Life An overview of Second Life, its structure, economy, creative tools, history, uses in education and business, and the social and legal issues that arise in a large persistent virtua…

Security-Enhanced Linux (SELinux): mandatory access control for Linux systems Security-Enhanced Linux SELinux is a set of kernel and user-space enhancements that implement label-based mandatory access control (MAC) for Linux and other Unix-like systems, used to confine programs and…

Semantic Web: Principles, Core Technologies, and Practical Uses Semantic Web An overview of the Semantic Web: purpose, core standards (RDF, RDFS, OWL, SPARQL), linked data principles, applications, challenges and practical adoption considerations.

Serbian Wikipedia Serbian-language edition of Wikipedia, started in 2003; notable for supporting both Cyrillic and Latin scripts and serving as a major online reference for Serbian speakers.

Serbo-Croatian Wikipedia (Srpskohrvatska Wikipedija) Serbo-Croatian Wikipedia A shared Wikimedia edition covering the Serbo-Croatian macrolanguage, using multiple standards and scripts; it complements separate Croatian, Serbian and Bosnian Wikipedias.

Server (computing): overview, types, architecture and uses Server A server is a computer or program that provides services to other computers (clients). This article explains roles, components, history, common types, networking protocols and depl…

Shock site A shock site is a web page designed to provoke strong negative reactions by displaying graphic, explicit, or disturbing content; used in pranks, harassment, and sometimes as cultur…

Sicilian Wikipedia: the Sicilian-language edition of Wikipedia Sicilian Wikipedia Sicilian Wikipedia is the Sicilian-language edition of the Wikimedia encyclopedia, created in 2004. It serves speakers and learners with articles in Sicilian and documents regional…

Simple English Wikipedia A version of Wikipedia written in basic, clear English for readers who want simpler vocabulary and shorter sentences, used by children, learners, and people with special language n…

Simple Network Management Protocol (SNMP) Simple Network Management Protocol SNMP is an Internet protocol used to monitor and manage networked devices by exposing structured management data for querying, configuration, and alerting across routers, switches,…

Sindhi Wikipedia Sindhi-language edition of Wikipedia serving speakers of Sindhi with articles in Arabic and Devanagari scripts, community-driven content, and a history beginning in 2006.

Skype — Internet calling, video chat, and messaging service Skype Skype is a communications application that provides voice and video calls, instant messaging, and related services across desktop and mobile platforms. It is known for VoIP calling…

Slashdot: a community-driven technology news site and its influence Slashdot Slashdot is a long-running technology news website that aggregates user-submitted stories, hosts threaded discussion, and shaped online community moderation and the "Slashdot effec…

Slovak Wikipedia (Slovenská Wikipédia) Slovak Wikipedia The Slovak-language edition of Wikipedia. Established in October 2003, it is a community-run, Slovak-language encyclopedia with over 120,000 articles, hosted by the Wikimedia Found…

Slovene Wikipedia (Slovenska Wikipedija) Slovene Wikipedia Slovene-language edition of Wikipedia, created in February 2002. A community-maintained online encyclopedia in Slovene that documents knowledge, supports language use, and serves l…

Sobig (computer worm) Sobig Sobig was a family of mass‑mailing Windows worms first detected in August 2003. The Sobig.F variant caused a major global email outbreak and installed a backdoor to retrieve furthe…

Social networking platforms: online services for connecting, sharing, and communities Social network service Overview of social networking platforms: how online services let people create profiles, connect, share content, join groups, and shape social and professional communities.

SOCKS (SOCKetS) — network proxy protocol, versions, uses and differences SOCKS SOCKS is a network proxy protocol that relays TCP/UDP traffic through an intermediary server. It supports multiple applications, offers varying authentication, and differs from HTT…

Spanish Wikipedia The Spanish Wikipedia is the Spanish-language edition of Wikipedia, launched in 2001. It is one of the largest versions of the project and serves readers and volunteer editors acro…

Squid cache — HTTP/FTP proxy and caching server Squid cache Squid is an open-source caching proxy that accelerates web access, enforces policies and supports HTTP, FTP and HTTPS. Originating at UC San Diego, it runs on Unix-like systems and…

SSH File Transfer Protocol (SFTP): secure file transfer over SSH SSH file transfer protocol SFTP (SSH File Transfer Protocol) is a network protocol that provides secure file access, transfer and management over an SSH transport, commonly used instead of FTP or FTPS for en…

Stage6 — high-quality video sharing service Stage6 Stage6 was a high-quality video-sharing site run by DivX, Inc., notable for supporting large DivX-encoded uploads and downloadable high-bitrate video files; active in the mid-2000s…

Steam (digital distribution platform) Steam (service) Steam is Valve Corporation’s digital distribution and social platform for games, software and media, providing purchase, updates, DRM, community features and cross‑platform clients…

Strong Bad — character from the Homestar Runner web cartoons Strong Bad Fictional antihero from the Homestar Runner web cartoons. Central to the long-running 'Strong Bad Email' series, known for distinctive mask and gloves, parodic sketches, and influe…

Sundanese Wikipedia (Wikipedia basa Sunda) Sundanese Wikipedia The Sundanese-language edition of Wikipedia: overview, size as of 2021, language features, community, uses for education and cultural preservation, and challenges facing the projec…

Sup'Internet — French private school for Internet studies Sup'Internet Sup'Internet is a private graduate school in Paris, founded in 2011. It offers bachelor's-level programmes in graphic design, internet management and web technologies with a practi…

Swatch Internet Time ('.beat') — decimal global timekeeping Swatch Internet Time Swatch Internet Time divides the day into 1,000 'beats' ('.beats') displayed as @000–@999. Introduced by Swatch in 1998, it uses Biel Mean Time (UTC+1) as a single worldwide refere…