What: A way to reorganize the fields in a relational database to reduce duplication, and ensure data is organized in a logical fashion. Example of duplication in a table of students: StudentID Name StateOfOrigin Address CourseStudentIsTaking 11 Alice OH 15 Lane Street Physics 12 Bob CA 18 Home Lane Biology 11 Alice OH 19 Star Blvd English 13 Chuck WA 1 Main Street ??? In the above table, if the student Chuck is not currently taking a class, we are unable to insert him into the list of students. Also, Alice appears twice, with different address and subject. We want a way to make sure that when she changes her address, we can update just one attribute in the database, not multiple times, to reduce mistakes we make. A better way to organize this is by having three tables instead: STUDENTS student_id NameOfStudent Address ROSTER student_id ClassTheyAreTaking ADDRESS student_id address state