Suppose we have bronze, silver, and gold layers. Where is data stored in each layer?

The bronze layer stores raw, unprocessed data in its original format, typically in an object store or distributed file system. The silver layer holds cleansed and enriched data, often in a Delta Lake or Iceberg table that supports ACID transactions. The gold layer contains curated, business‑ready datasets optimized for analytics, usually stored in a columnar format within the same lake or in a dedicated warehouse. Each layer progressively refines the data, providing a clear lineage and supporting different use cases.