Solid (solidproject.org) is a very interesting initiative, triggered by Sir Tim Berners-Lee, inventor of the World Wide Web, aiming to radically change the way Web applications work today, resulting in true data ownership as well as improved privacy.
Solid (derived from "social linked data") is a proposed set of conventions and tools for building decentralized social applications based on Linked Data principles.
Modular and extensible, Solid enables richer choices for people, organizations, and app developers by building on and relying as much as possible on existing web standards and protocols from World Wide Web Consortium (W3C - w3.org).
More information about W3C Solid could be found here :
in English: https://startinblox.com/blog/index.php/2020/11/20/a-solid-future/
in French: https://blog.orgtech.fr/un-avenir-solid/