A data lake is where a vast amount of raw data or data in its native format is stored. Unlike a data warehouse which stores data in files or folders (a hierarchical structure), Data Lakes provide unlimited space to store data, unrestricted file size and a number of different ways to access data, as well as providing the tools necessary for analyzing, querying, and processing.
source https://www.c-sharpcorner.com/article/what-is-azure-data-lake/
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