BCNF, or Boyce Codd Normal Form, is a stricter version of the third normal form in database normalization that addresses transitive dependencies. In BCNF, for each functional dependency in a table, the left side must consist solely of a candidate key. This contrasts with the third normal form where candidate keys could be part of the left side, but not the only requirement. An example using a student table illustrates these concepts. The table contains attributes such as roll number, name, voter ID, and age, with roll number and voter ID functioning as candidate keys. The functional dependencies include the associations between roll number, voter ID, name, and age. Each functional dependency is examined individually to confirm that the left side aligns with the conditions of BCNF. When checking the left side of each functional dependency against the candidate keys, it is validated that both roll number and voter ID meet the criteria under BCNF conditions. The validation process continues for all functional dependencies, reinforcing that to meet BCNF standards, the left-hand side of each must be a candidate key or potentially a super key. Thus, understanding BCNF is essential for ensuring database structures are free from unwanted dependencies and anomalies.