What does 1NF ensure in terms of data storage?

First Normal Form (1NF) is a fundamental principle of database normalization that focuses on ensuring the atomicity of data stored in a relational database. It posits that each column in a table should contain a single, indivisible piece of data. This means that no column should have multiple values or collections of values, which facilitates clear organization and easy access to data.

By adhering to 1NF, databases can prevent complications that arise from trying to query, validate, or update data that is stored in a non-atomic manner. If a column stores multiple values, retrieving or filtering specific data becomes more complex and error-prone. Consequently, ensuring that each column holds only a single data piece enhances data integrity and simplifies database operations.

Other choices mention concepts that do not align with the purpose of 1NF. For instance, maintaining data consistency across multiple fields or managing relationships across tables pertains to other normalization forms or database design principles, but not specifically to the requirements of 1NF.