Here's a list of just the best known ones [0]. There are literally hundreds of thousands of open standards for everything from communications to mechanical engineering, to packaging to chemical formulas....
They make the world go round.
No piece of technology you use today, especially the Internet would function without open standards and standards bodies.
For some reason bits of the digital tech industry, in particular media and entertainments, have a parochial disconnection with the rest of reality and forget that they stand on the shoulders of giants and operate with the assent of everyone else in the world giving them the standards space within which to work.
[0] https://en.wikipedia.org/wiki/List_of_technical_standard_org...