AWS Glue ETL

AWS Glue is a serverless ETL (Extract, Transform, Load) service. Glue Crawlers automatically discover data schemas from S3, databases, and APIs. Glue Jobs transform and move data using Spark scripts (Python or Scala). The Glue Data Catalog stores metadata, accessible to Athena, Redshift, and Lambda. Use for: data warehouse ingestion, data lake pipelines, data cleaning, format conversion (CSV to Parquet), schema normalization.