A brand voice is usually defined by a handful of traits, each with an example of what it sounds like and what it does not. Writing those down turns a feeling into something a team, a freelancer or an AI tool can apply, and it is the difference between content that sounds like one source and content that sounds like a committee.
Voice is easiest to hear in the details: word choice, sentence length, whether a brand says I or we, and how it handles humour, complaints and bad news. Consistency matters more than any single trait, because trust grows when people know what to expect.
