Third Normal Form (3NF) is a database normalization technique used to reduce data redundancy and improve data integrity. A table is in 3NF if it is already in Second Normal Form (2NF) and all its non-key attributes are functionally dependent only on the primary key. This means that no non-key attribute should depend on another non-key attribute. By achieving 3NF, databases minimize the chances of anomalies during data operations like insertion, deletion, or updating. This structure helps ensure that each piece of information is stored in only one place, making it easier to maintain and manage the data effectively.