Broadly speaking, interpersonal skill is your ability to communicate, cooperate, connect, relate, and work with others. In fact, in any interaction between two people where information is being exchanged, including both verbal and nonverbal communication, interpersonal skills are in play. Everyone is of course different. You may know someone with great interpersonal skills, and another person lacking some interpersonal skills. People with great interpersonal skills are generally more successful both professionally and personally than those without.interpersonal skills