A brand essence is a succinct articulation—typically three-to-five words—of the core idea(s) around which a brand is built.
A brand audit is a comprehensive examination of a brand across all its touchpoints.
Brand image is the cumulative impression of a brand among target audiences.
Brand identity is the cumulative expression of a brand to target audiences.
Brand strategy is an articulation of the ideas upon which a brand is built and/or the plan for systematically expressing those ideas through identity and brand experience(s).
Definition of brand personality: a set of human personality traits ascribed to a brand.