What is it and how can you leverage it for local SEO?
Voice search marketing is the optimization of data and content with the intention of it appearing in voice search results (Google Assistant or Apple's Siri, for example).
SEO health factors like quality backlinks and a high authority score are also deciding factors in appearing in voice search results.
But don't try to rank for voice search by simply gaming the algorithms; focus on the human being on the other end of the search and what they would like to hear spoken back to them.