Final answer:
Self-disclosure is the purposeful divulging of personal information, varying from superficial to deep, crucial for relationship development.
Explanation:
Self-disclosure is the process of purposefully revealing personal information to another person. It can range from superficial details to deep, vulnerable information, helping build relationships. The Social Penetration Theory likens self-disclosure to peeling back the layers of an onion, where disclosure increases as the relationship progresses.
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