A fully managed ETL service by AWS, whihc is used for preparing data for analytics. It runs ETL jobs on fully managed scale-out Apache Spark Environment. See AWS Glue Jobs for job patterns. AWS Glue discovers data and stores metadata (e.g. table definition and schema) in the Data Catalog. Works with data lakes like Snowflake , data warehouses like Redshift, and data stores like RDS or Database on EC2.
You can use a crawler to populate the AWS Glue Data Catalog with tables. A crawler can crawl multiple data stores in a single run. Upon completion, the crawler creates or updates one or more tables in your Data Catalog and are used by ETL jobs that you define in AWS Glue.