Interpersonal Therapy (IPT) is a structured, time-limited therapy focusing on how relationships and life events impact mood, especially depression, by improving interpersonal functioning to relieve symptoms. Therapists help clients identify issues in key relationships (grief, disputes, role changes, deficits) and develop skills to resolve them, aiming to reduce depression and improve social connection, typically over 12-16 weeks. It's an evidence-based treatment for depression and other conditions, often recommended by the WHO.