The word charisma refers to a rare trait found in certain human personalities usually including extreme charm and a "magnetic" quality of personality or appearance along with innate and powerfully sophisticated personal communicability and persuasiveness; in short, charisma is often used to describe a seemingly uncanny ability to charm or influence people. It refers especially to a quality in certain people who easily draw the attention and admiration (or even hatred if the charisma is negative) of others due to a "magnetic" quality of personality or appearance. Though the term as it stands is extremely difficult to define, other similar terms related to charisma include: grace, exuberance, equanimity, mystique, positive energy, joie de vivre, extreme charm, personal magnetism, personal appeal, "electricity," and allure, among many others. Another term constantly used is the "X-factor." Usually many of these qualities must be present within a single individual for the person to be considered highly charismatic by the public and their peers.