ETYM German See Scheme.
An internal representation of the world; an organization of concepts and actions that can be revised by new information about the world.

The structure of an entire database. The information that describes the schema is the database’s metadata.
A description of a database to a database management system (DBMS) in the language provided by the DBMS. A schema defines aspects of the database, such as attributes (fields) and domains and parameters of the attributes.