What features does a many-to-many relationship have?

A many-to-many relationship is characterized by the fact that one object from the first entity can correspond to multiple objects from the second, and vice versa. Features:

• It is usually implemented using an intermediate table (join table) that stores pairs of relationships.
• Such a relationship allows flexible modeling of complex relationships, for example, students and courses, where a student can attend multiple courses, and a course can include many students.
• When working with such relationships, it is important to consider query performance and data integrity.
• ORM often provides special mechanisms for convenient management of such relationships, including cascade operations and lazy loading.

Example: table students, table courses, and table student_courses with foreign keys to both tables.