Best friend, old friend, good friend, bff, college roommate, neighbor, workplace confidante: Women's friendships are a lifeline in times of trouble and a support system for daily life. A friend can be like a sister, daughter, mother, mentor, therapist, or confessor--or she can be all of these at once. She's seen you at your worst and celebrates you at your best. Figuring out what it means to be friends is, in the end, no less than figuring out how we connect to other people.