The tone of voice is about how your business comes through in your words, both written and spoken; it’s also about the impression that makes on everyone in your audience. The tone of voice expresses the brand’s personality and set of values. Brands pay attention to their tone of voice because it shows the people who are behind the brand that makes a company more personalized. This concept sets you apart from the rest, builds trust and the like.
To learn more, read this article Tone of Voice Strategy in Technical Documentation