Solid lets people store their data securely in decentralized data stores called Pods. Pods are like secure personal web servers for data. All data in a pod is accessible via the Solid Protocol. When data is stored in someone’s pod, they control who and what can access it.
The ultimate goal of Solid is to allow users to have full control of their own data, including access control and storage location. To that end, Tim Berners-Lee formed a company called Inrupt to help build a commercial ecosystem to fuel Solid.
This is not free software.