Web and technology
W3C
Abbreviation for World Wide Web Consortium
In short and in plain language
The W3C is a body for the web. It is international.
It makes the technical rules for the web.
This includes the languages used to build and style web pages.
It also wrote the guidelines for accessible web content. Rules on access refer to them.
Definition
The W3C is the international body that develops technical standards for the web. These include HTML, CSS and the guidelines for accessible web content that accessibility rules refer to.