De facto Standards :

Please refer the definition from Wikipedia.

1. De facto is a Latin expression that means “by [the] fact”.
2. In law, it is meant to mean “in practice but not necessarily ordained by law

American National Standards Institute [ ANSI ]

1. Founded in 1918
2. Number of Members : 1,300 members (including all the large computer companies ]
3. ANSI Creates standards for the computer industry
4. For example : ANSI C is a version of the C language that has been approved by the ANSI committee.
5. To a large degree, all ANSI C compilers, regardless of which company produces them, should behave similarly.