# Keynote presentations: What do we need from Zarr V4?

## Link to slides (if speaker wants)

## Notes

What's so special about Zarr?
- boilds data down to its essense: compressed chunks of numerical values and metadata
- Lowest common demominator for data and can subsume many existing forms
- Users can focus on high-level data model
- Scales to extremely large datasets

If Zarr isn't a file format, what is it?
A database!

Ryan's wishlist for Zarr 4
- Zarr as a database
- allows zarr to store more things (e.g., manifests, indexes)
- provides concurrent access, acid transactions, query engines
- Zarr as a catalog
- unlocked by zarr as a database
- requires a way to also search quickly Zarr metadata
- would simplify data processing pipelines, less infrastructure
- Zarr for scientific AI
- Zarr community power
- Completely subsume Zarr 2/3

Challenge
- Can we put all of Sentinel into a single Zarr Collection?

Zarr Developer Community
- decentralized nature is both its greatest strength and its greatest risk.

## ?s