Do you know what Delta Lake is and what it does?
💡 Model Answer
Delta Lake is an open‑source storage layer that brings ACID transactions, scalable metadata handling, and unifies streaming and batch data processing to cloud data lakes. It sits on top of existing object stores (S3, ADLS, GCS) and adds a transaction log (the Delta Log) that records every change to the data. This log enables features such as time‑travel, schema enforcement, and schema evolution. Delta Lake also supports concurrent reads and writes, allowing multiple writers to update the same dataset without conflicts. By using Delta Lake, teams can treat a data lake like a relational database, ensuring data quality and consistency while retaining the cost‑effective scalability of a lake. It is tightly integrated with Databricks, Spark, and other big‑data tools, making it a popular choice for modern data engineering pipelines.
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