de facto standard definition
A widespread consensus on a particular product or protocol
which has not been ratified by any official standards
body, such as ISO
, but which nevertheless has a large market share.
The archetypal example of a de facto standard is the IBM PC
which, despite is many glaring technical deficiencies, has gained such a large share of the personal computer
market that it is now popular simply because it is popular and therefore enjoys fierce competition in pricing and software development.