Server interfaces define the contract between a grid client and the backing providers that supply schema, data and metadata.

Revgrid separates concerns into three interfaces:

1. Schema: column and field structure.
2. Data: row count, value access, and change notifications.
3. Meta: optional per-row/per-cell metadata used for styling and UX affordances.

All built-in server implementations in src/code/*/server implement these contracts directly or via composition.