The document discusses brand personality as defined by the American Marketing Association and researcher Jennifer Aaker. According to the AMA, brand personality is the psychological nature of a brand as intended by its sellers, though how consumers perceive it may differ. Aaker defines brand personality as consisting of human demographic traits, lifestyle characteristics, and personality traits. She developed a framework of five major brand personality dimensions - sincerity, excitement, competence, sophistication, and ruggedness - which encompass specific traits that can explain most of the variance between brands' personalities. A brand's personality develops through interactions between the brand, its products, services, organization, and users, and is influenced by both product-related and non-product-related characteristics.