What is a standard?

Standard ENEN
European Standard
45020:1998 defines a standard as a “... document ... that provides, for common and repeated use, rules, guidelines for activities or their results ...”.
Thus, a standard is a document that describes the typical properties and features of a product, a process or a service.
“... document established by consensus ...”
So a standard is not the work of an individual interest group pursuing its own purposes. A standard is always written in agreement with others.
“... document ... approved by a recognized body ...”

A standard requires approval by an institution that is above interests held by individual parties. This is to ensure that standards are scrutinized for suitability before they are published.