The video discusses the second normal form in database normalization, focusing on the criteria required for a table to achieve this form. It must first meet the requirements of the first normal form, and there should be no partial dependency present. To better understand partial dependency, the presenter explains the concept of dependency, using a student table as an example. In this table, the student ID serves as the primary key, uniquely identifying each record. The video emphasizes that one primary key can often fetch all data for a specific row. However, the presenter then explores a more complex situation where a composite primary key may be necessary. This leads to a discussion on partial dependency, which arises when a non-key attribute depends on only a part of a composite primary key rather than the whole key. This concept is critical for maintaining data integrity and efficiency in database design. The video encourages viewers to watch previous content if they are unfamiliar with the first normal form, reinforcing a structured approach to understanding database normalization.