According to Gardner, Interpersonal Intelligence is the ability to understand other people: what motivates them, how they work, how to work cooperatively with them. Successful salesperson, politicians, teachers, clinicians, and religious leaders are all likely to be individuals with high degrees of interpersonal intelligence.
Interpersonal Intelligence includes the capacities to discern and respond appropriately to the moods, temperaments, motivations, and desires of other people.
Daniel Goleman, 1995. Emotional Intelligence. New York: Bantam Books. Page 44.