Hi David 👋, welcome to the Outdefine platform! That's a good question.A primary key in a Relational Database is a unique identifier for each record, ensuring no duplicates. It's a special column that maintains data integrity! Thanks. 

A primary key in a relational database is a unique identifier for each record in a table. It is used to ensure that each record can be uniquely identified and retrieved. The primary key must be unique for each record and cannot contain null values. It is often used to establish relationships between tables in a database through foreign keys. The primary key is essential for maintaining data integrity and ensuring the accuracy and consistency of the database.