Final answer:
A schema in a database is the structure or design that defines the organization and relationships between tables. It consists of a set of attributes (columns) and a set of tuples (rows) that store the data.
Step-by-step explanation:
A schema in a database refers to the structure or design of the database. It represents the logical and conceptual blueprint of the database, defining the organization and relationships between different tables or entities. The structure of a schema typically consists of a set of attributes (columns) and a set of tuples (rows or records) that store the actual data.