What is a Junction Object used for in Salesforce?

A Junction Object in Salesforce is specifically designed to establish a many-to-many relationship between two objects. In situations where you need to link multiple records from one object to multiple records of another object, a Junction Object serves as an intermediary that allows this relationship to be effectively managed.

For example, in a scenario involving students and courses, a Junction Object could be used to link students (one object) to courses (another object), enabling a single student to enroll in multiple courses while also allowing each course to have multiple students. This is accomplished by creating two Master-Detail relationships with the Junction Object, tying together the two parent objects.

The other options do not accurately describe the purpose of a Junction Object. Creating a hierarchical structure pertains more to the use of a parent-child relationship, storing user activity logs relates to tracking data rather than relationship management, and managing external data connections is more aligned with different integration features in Salesforce rather than the use of a Junction Object.