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".
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".
Source: Wikipedia "De facto standard" · CC BY-SA 4.0
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