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A de facto standard is a custom or convention that is commonly used even though its use is not required. De facto is a Latin phrase (literally " of fact "), here meaning "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established".
The term "de facto standard" is used for both: to contrast obligatory standards (also known as "de jure standards"); or to express a dominant standard, when there is more than one proposed standard. In social sciences, a voluntary standard that is also a de facto standard, is a typical solution to a coordination problem. [15]
A widely used de facto standard, introduced with XGA-2 and other early "multiscan" graphics cards and monitors, with an unusual aspect ratio of 5:4 (1.25:1) instead of the more common 4:3 (1. 3:1), meaning that even 4:3 pictures and video will appear letterboxed on the narrower 5:4 screens. This is generally the native resolution—with ...
The term de jure standard refers to a standard mandated by legal requirements or refers generally to any formal standard. In contrast, the term de facto standard refers to a specification (or protocol or technology) that has achieved widespread use and acceptance – often without being approved by any standards organization (or receiving such ...
In contrast, a custom, convention, company product, corporate standard, and so forth that becomes generally accepted and dominant is often called a de facto standard. A technical standard may be developed privately or unilaterally, for example by a corporation, regulatory body, military, etc. Standards can also be developed by groups such as ...
Dominant design is a technology management concept introduced by James M. Utterback and William J. Abernathy in 1975, identifying key technological features that become a de facto standard. [1] A dominant design is the one that wins the allegiance of the marketplace, the one to which competitors and innovators must adhere if they hope to ...
By June 1994 it had become a de facto standard; [6] most complied, including those operated by search engines such as WebCrawler, Lycos, and AltaVista. [7] On July 1, 2019, Google announced the proposal of the Robots Exclusion Protocol as an official standard under Internet Engineering Task Force. [8]
The de facto standard 5.25 inch FDD interface is based upon the Shugart Associates SA400 [6] FDD. [5]: 169 The signal interface uses a 34-pin PCB edge connector which mates to a flat ribbon cable connector. DC power is provided on a separate connector. [6] The 34-pin connector is similar in pinout to the standard 50-pin connector for 8 inch FDDs.