Answer
The AWS Glue Data Catalog acts as a central metadata repository that stores information about the structure and location of your data, such as table schemas and partition details, and Athena relies directly on this catalog to know how to interpret the raw files sitting in S3 as structured tables that can be queried with SQL.
aws glue create-table --database-name mydb --table-input file://table-definition.jsonReal-world example A data engineering team uses a Glue crawler to automatically scan a folder of JSON files in S3 and populate the Glue Data Catalog, allowing analysts to immediately query that same data through Athena.