Web, domains and email
W3C
Abbreviation for World Wide Web Consortium
In short and in plain language
The W3C is a group from many lands.
It makes tech rules for the web.
These include rules for web content that all people can use.
Many demands on a site that all can use are based on its advice.
Definition
The W3C is an international body that develops technical standards for the web. These include the guidelines for accessible web content. Many requirements for an accessible website are based on its recommendations.