This was a great article from Search Engine Land, a reputable SEO news creation and curation site, about how quickly hands-free search is evolving.
Talking into Google search, rather than manually typing it into a search box, is called voice search, and it's predicted to soon be the dominant way searches are conducted.
People using personal assistant apps and taking advantage of the hands-free search capability while driving are two of the most popular forms of voice search.
It's still a growing trend, and there's not much research available on how to optimize a website or SEO strategy for voice search, but it's something to just be aware of for now. It definitely has the potential to become the most common form of search in the not-so-distant future.