1. A relational database utilizes primary keys to uniquely identify each record across related tables. Primary keys allow data to be stored in multiple tables.
2. Relationships are established between tables using primary keys, which enable data to be linked and queried across related tables.
3. Other key features include normalization, which structures the database in a way that reduces redundancy and improves data integrity. Relational databases also use SQL queries to efficiently retrieve and manipulate data stored across multiple tables.