Explain the concept of partial dependency and its relevance in normalization.

Partial dependency is a concept in database normalization where an attribute is functionally dependent on only a part of a composite primary key. In other words, it occurs when a non-key attribute depends on a subset of the primary key rather than the entire primary key. This can lead to data redundancy and anomalies in the database. By identifying and eliminating partial dependencies through normalization techniques like second normal form (2NF) and third normal form (3NF), databases can be structured more efficiently, reducing redundancy and ensuring data integrity.