Internals
Row Groups
DuckDB's storage format stores the data in _row groups,_ i.e., horizontal partitions of the data.
This concept is equivalent to [Parquet's row groups](https://parquet.apache.org/docs/concepts/).
Several features in DuckDB, including [parallelism](#docs:guides:performance:how_to_tune_workloads) and [compression](https://duckdb.org/2022/10/28/lightweight-compression) are based on row groups.