Databricks Certified Data Engineer - Associate

Delta Lake uses versioned Parquet files to store your data in your cloud storage. Apart from the versions, Delta Lake also stores a transaction log to keep track of all the commits made to the table or blob store directory to provide ACID transactions. While Delta Lake provides additional features like ACID transactions, time travel, and schema enforcement, the underlying data storage format is Parquet, which is an open-source columnar storage format optimized for big data processing.