A database is a structure for storing and organizing data. Databases are comprised of elements such as tables, rows, columns, indexes, constraints, procedures, and functions. These elements are used in storing and retrieving data. A database consists of both the schema and the data it contains.
MariaDB Enterprise Server is a Relational Database Management System (RDBMS). As an RDBMS, MariaDB Enterprise Server stores and maintains structured data. MariaDB Enterprise Server enables management of database schema and data using standard SQL statements.
In addition to user databases, MariaDB Enterprise Server exposes internals as structured data through the Performance Schema and Information Schema databases.
Information on this topic can be found in the MariaDB Public KB.