What is a database and how does a relational database organize data?

• Define a database.

• Define and explain the significance of entities, attributes, and key fields.

• Define a relational database and explain how it organizes and stores information.

• Explain the role of entity-relationship diagrams and normalization in database design.

• Define referential integrity and explain its role in relational database systems.

• Define a nonrelational database management system and explain how it differs from a relational DBMS.