One of the Fediverse’s most-repeated selling points is the following premise:
YOU OWN YOUR DATA.
It’s a wonderful sentiment, the idea that you can pack up everything and take it with you. The problem is, most platforms on the network can, at best, redirect your followers to a new account.
What if we had an easier way to represent data ownership and give users total control of it?
#ActivityPods is a combination of two W3C standards:
#ActivityPub, for data federation and networks, and the
#Solid specification for data storage and access.
The ideals of both projects put together create a compelling vision:
data control, across user applications, in service to communication across the web.
In Solid’s world, everyone’s personal data lives in a Pod.
This is your personal data locker, where your media, files, and personal data all live together. One Solid Pod belongs to one person.
Conceptually, your Solid Pod looks and works very similarly to Google Drive, iCloud, or Nextcloud:
to the user, it just feels like a big folder with your stuff in it.
In fact, using a Pod that way is not out of the question, but the technology serves a much bigger purpose
A Solid pod can take a few different forms:
Documents: Notes, Spreadsheets, Manuscript files, Presentations
Media: Pictures, Video, Audio
Data: Metadata in various formats
Instead of relying on a database to store data, solid apps read data straight from files in your pod.
The data is specifically formatted in such a way that Solid apps can read it.
https://wedistribute.org/2024/04/activitypods-federated-solid-pods/
in calmness 
