The metadata definition that represents your data. Whether your data is in an Amazon Simple Storage Service (Amazon S3) file, an Amazon Relational Database Service (Amazon RDS) table, or another set of data, a table defines the schema of your data. A table in the AWS Glue Data Catalog consists of the names of columns, data type definitions, partition information, and other metadata about a base dataset. The schema of your data is represented in your AWS Glue table definition. The actual data remains in its original data store, whether it be in a file or a relational database table. AWS Glue catalogs your files and relational database tables in the AWS Glue Data Catalog. They are used as sources and targets when you create an ETL job.