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DeepSeek V4 release
DeepSeek V4 is a pair of open-weight mixture-of-experts language models, DeepSeek-V4-Pro and DeepSeek-V4-Flash, released by the Chinese AI lab DeepSeek in April 2026 under the MIT license with million-token context windows.
DeepSeek-Coder
DeepSeek-Coder is a family of open-weight code language models released by the Chinese AI lab DeepSeek starting in November 2023, in sizes from 1.3B to 33B parameters.
DeepSeek-R1
DeepSeek-R1 is an open-weight reasoning model released by China's DeepSeek lab in January 2025, trained with reinforcement learning to match OpenAI's o1 and downloadable under the MIT license.
DeepSeek-V3
DeepSeek-V3 is an open-weight Mixture-of-Experts large language model with 671 billion total parameters, 37 billion active per token, released in December 2024 by the Chinese AI lab DeepSeek.
DeepSeek-VL2
DeepSeek-VL2 is a family of three open-weight Mixture-of-Experts vision-language models released by DeepSeek on December 13, 2024, in Tiny, Small, and base variants for OCR, document and chart understanding, and visual grounding.
DeepSpeed
DeepSpeed is an open-source deep learning optimization library developed by Microsoft, released in February 2020 and best known for the ZeRO memory optimizer for large models.
DeepStack
DeepStack is an artificial-intelligence program for heads-up no-limit Texas hold'em, developed by the University of Alberta with Czech universities, that beat professional poker players, published in Science in 2017.
DeepTICA
DeepTICA is a machine learning method that builds collective variables for molecular dynamics simulations by combining neural networks with time-lagged independent component analysis, introduced in 2021.
Deepwater Horizon
Deepwater Horizon was an offshore drilling rig that exploded on April 20, 2010, in the Gulf of Mexico, killing 11 workers and spilling millions of barrels of oil.
Deequ
Deequ is an AWS Labs open-source Scala library for defining "unit tests for data" on Apache Spark, scaling constraint verification, profiling, incremental metrics, and anomaly detection to billions of rows; PyDeequ provides a Python interface, and AWS Glue and EMR Data Quality run on its engine.
Deer Island Waste Water Treatment Plant
The Deer Island Waste Water Treatment Plant is Boston's main sewage treatment facility, operated by the MWRA, serving 2.3 million people in 43 Greater Boston communities.
Deer Park Energy Center
The Deer Park Energy Center is a natural gas-fired combined-cycle cogeneration plant in Deer Park, Texas, owned by Calpine, supplying electricity and steam since 2003.
Deezer
Deezer, also known as Deezer.com or Blogmusik, is a French music streaming service founded in Paris in 2007, offering about 120 million tracks in over 180 countries.
DEF CON
DEF CON, also known as the Defcon conference, is an annual hacker convention held in Las Vegas each August, founded in 1993 by Jeff Moss, known as "The Dark Tangent."
Default deny
Default deny, or deny by default, is a network security policy in which a firewall blocks all traffic not expressly permitted, recommended by NIST SP 800-41.
Default gateway
A default gateway, also called a default router, is the router a host uses to send packets to destinations outside its local subnet, often assigned by DHCP.
Default logic
Default logic is a formal system for nonmonotonic reasoning introduced by Raymond Reiter in 1980, in which plausible conclusions from incomplete information can be retracted when new facts arrive.
Defect density
Defect density is a software quality metric defined as the number of defects divided by software size, usually reported as defects per thousand lines of code (KLOC).
Defect tolerance
Defect tolerance is a concept in semiconductor physics describing materials that stay efficient despite high defect densities, best known in lead-halide perovskites, which made low-cost solution-processed solar cells possible.
Defect triage
Defect triage is the software process of reviewing, classifying, prioritizing, and routing reported bugs, deciding for each whether it will be fixed, deferred, or rejected.
Defence industry of India
The Defence industry of India, also known as the arms industry in India, is a network of state-owned and private firms making military equipment, with record production of Rs 1.78 trillion in FY 2025-26.
Defence industry of Ukraine
The defense industry of Ukraine, also known as the arms industry in Ukraine, inherited about 30% of Soviet arms capacity in 1991 and has expanded rapidly since Russia's 2022 invasion.
Defence of the Reich
The Defence of the Reich (German: Reichsverteidigung) was the Luftwaffe's strategic air defense campaign over Germany and occupied Europe during World War II, opposing the Anglo-American bomber offensive.
Defence Research Agency
The Defence Research Agency (DRA) was an executive agency of the UK Ministry of Defence, formed in 1991 from four non-nuclear research establishments and merged into DERA in 1995.
Defence Research and Development Canada
Defence Research and Development Canada (DRDC; French: Recherche et développement pour la défense Canada) is the science and technology agency of Canada's Department of National Defence, with seven research centers.
Defence Research and Development Organisation (रक्षा अनुसंधान एवं विकास संगठन)
The Defence Research and Development Organisation (रक्षा अनुसंधान एवं विकास संगठन), known as DRDO, is India's agency for military research under the Ministry of Defence, formed in 1958.
Defence Science and Technology Group
The Defence Science and Technology Group (DSTG), formerly the Defence Science and Technology Organisation, is the research arm of Australia's Department of Defence, created in 1974.
Defence Science and Technology Laboratory
The Defence Science and Technology Laboratory (Dstl) is a UK Ministry of Defence executive agency providing in-government science and technology, created in 2001 from the split of DERA.
Defense Acquisition Program Administration
The Defense Acquisition Program Administration (방위사업청, DAPA) is South Korea's central defense procurement agency, established on January 1, 2006, under the Ministry of National Defense.
Defense in depth
Defense in depth is a security strategy that layers multiple independent safeguards so a system stays protected when one control fails, increasing attacker work factor and detection likelihood.