Brand personality refers to the human characteristics associated with a brand that distinguish it from other brands. It is how a brand behaves and includes traits like age, gender, socioeconomic class, and emotional attributes. A brand's personality is built over time based on consumers' experiences and is meant to create an emotional connection between the brand and consumers. It allows brands to have a sense of identity beyond just product attributes. The document provides several examples of brands and the personalities they convey like Bisleri conveying safety and Marlboro conveying ruggedness. It also discusses Aaker's model of five core brand personality dimensions of sincerity, excitement, competence, sophistication, and ruggedness.