A junction object in Salesforce is a custom object that enables you to create a many-to-many relationship between two objects. It acts as a bridge connecting two distinct objects, allowing for complex data relationships that standard Salesforce functionalities might not directly support. Imagine you have two standard objects, “Students” and “Courses.” A single student can enroll in multiple courses, and a single course can have multiple students. A junction object, such as “Enrollments,” would link these two objects, effectively managing the many-to-many relationship.