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etcd
etcd is a distributed, strongly consistent key-value store created at CoreOS in 2013, best known as Kubernetes' backing store, replicating data through the Raft consensus protocol.
Etched
Etched is a semiconductor startup, founded in 2022 by Gavin Uberti, that builds Sohu, a chip hard-wired for transformer-model inference, with over $1 billion in customer contracts.
Etchells (keelboat)
The Etchells is a one-design racing keelboat about 30 feet long, designed in 1966 by American boatbuilder Skip Etchells and adopted as an international class in 1974.
Etching (microfabrication)
Etching in microfabrication is a process that selectively dissolves or ablates material to transfer lithographic patterns, done wet with chemicals or dry with plasma, dozens of times per chip.
Etelebou Oil and Gas Field
The Etelebou Oil and Gas Field is an operating onshore oil and gas field in Bayelsa State, Nigeria, long operated by Shell and known for its flow station at Ogboloma.
Eternal Limited
Eternal Limited, formerly Zomato Limited until 2025, is an Indian technology company founded by Deepinder Goyal that operates the Zomato food delivery app, Blinkit quick commerce, District, and Hyperpure.
EternalBlue
EternalBlue is an exploit developed by the US National Security Agency against a Windows SMBv1 flaw, leaked in April 2017 and used by WannaCry and NotPetya.
Ethan Allen (armsmaker)
Ethan Allen (1808–1871) was an American gunmaker and inventor, born in Bellingham, Massachusetts, best known for the double-action pepperbox revolver made by his firms Allen & Thurber and Allen & Wheelock.
Ethan Couch
Ethan Couch, born in 1997, is the Texas teenager who killed four people while driving drunk in 2013 and got 10 years' probation after an "affluenza" defense.
Ethan Zuckerman
Ethan Zuckerman is an American internet scholar who wrote the code for the first pop-up ad at Tripod.com, publicly apologized for it, and co-founded the citizen-media community Global Voices.
Ethanol fuel
Ethanol fuel, also called bioethanol, is a renewable motor fuel made by fermenting plant sugars and blended with gasoline, mostly from corn in the United States.
Ethanol steam reforming
Ethanol steam reforming is a catalytic process in which ethanol reacts with steam above 500 °C to produce hydrogen, studied as a renewable route from bioethanol.
Ethanol-to-jet fuel
Ethanol-to-jet fuel (ETJ) is a sustainable aviation fuel pathway that catalytically converts ethanol, usually bioethanol from corn or waste, into jet-range hydrocarbons, certified under ASTM D7566 in 2016.
Ether electrolytes for lithium–sulfur batteries
Ether electrolytes for lithium–sulfur batteries are liquid electrolytes built on ether solvents like DME and DOL, widely used because they dissolve polysulfides but suffer from the shuttle effect.
EtherCAT
EtherCAT (Ethernet for Control Automation Technology) is a real-time Industrial Ethernet technology developed by Beckhoff Automation, standardized in IEC 61158, achieving cycle times of 100 microseconds or less.
EtherChannel
EtherChannel is a Cisco port-trunking technology that bundles multiple physical Ethernet links into a single logical link, providing higher bandwidth and sub-second failover; it predates the IEEE 802.3ad standard, announced by Cisco in 1998.
Ethereum Classic
Ethereum Classic (ETC) is a proof-of-work smart contract blockchain formed in 2016 by miners who kept the original, unforked Ethereum chain after the DAO hard fork.
Ethereum Foundation
The Ethereum Foundation (Stiftung Ethereum) is a Swiss nonprofit founded in Zug in 2014 by Vitalik Buterin's team to fund research and development for the Ethereum blockchain.
Ethereum Name Service
The Ethereum Name Service (ENS) is a decentralized naming system built on Ethereum that maps human-readable names like 'alice.eth' to addresses; it launched in May 2017.
Ethereum Virtual Machine
The Ethereum Virtual Machine (EVM) is the decentralized runtime environment that executes smart contracts and processes transactions on Ethereum, adopted in compatible form by many other blockchains.
Ethernet
Ethernet is a family of wired local area network technologies, standardized as IEEE 802.3, invented at Xerox PARC in 1973 by Robert Metcalfe and David Boggs.
Ethernet Alliance
The Ethernet Alliance is a global non-profit industry consortium, formed in 2006 by 18 member companies, that promotes Ethernet technologies and interoperability of IEEE 802 Ethernet standards.
Ethernet crossover cable
An Ethernet crossover cable is a twisted-pair cable wired so transmit pins connect to receive pins, linking two similar devices, such as two computers or switches, directly.
Ethernet extender
An Ethernet extender, also called a LAN extender or network extender, is a matched pair of devices that extends Ethernet beyond the 100-meter limit over existing telephone or coaxial cable.
Ethernet flow control
Ethernet flow control, also known as PAUSE flow control, is a link-level mechanism where a receiver tells its peer to stop transmitting, standardized in IEEE 802.3x in 1997.
Ethernet frame
An Ethernet frame is the unit of data transmitted over Ethernet, defined by the 1980 DIX specification and IEEE 802.3, with MAC addresses, a payload, and a CRC.
Ethernet hub
An Ethernet hub, also called a multiport repeater, is a Layer 1 network device that repeats every signal to all ports, later displaced by switches.
Ethernet LAN service
Ethernet LAN service (E-LAN) is a Carrier Ethernet service type, defined by MEF, that connects three or more subscriber sites in a multipoint-to-multipoint Layer 2 network.
Ethernet over coax
Ethernet over coax is the practice of carrying Ethernet data over existing coaxial cable using adapter pairs, with MoCA 2.5 reaching rates up to 2.5 Gbps.
Ethernet over fiber
Ethernet over fiber is the transmission of Ethernet frames over optical fiber rather than copper cable, giving far longer reaches and speeds up to 400 Gb/s in the IEEE 802.3-2022 standards.