
Explanation:
Box 1: Azure Synapse Analytics
Output data to parquet format.
Box 2: Azure Data Lake Storage
Azure Data Lake Storage (ADLA) now natively supports Parquet files. ADLA adds a public preview of the native extractor and outputter for the popular Parquet file format Box 3: Azure SQL Database Persist a tabular representation of data that is stored in parquet format.
Reference:
https://docs.microsoft.com/en-us/azure/data-factory/supported-file-formats-and-compression- codecs