Don't think that voice search is a completely new, uk email database separate mechanism. Both Google and Yandex use algorithms that we already know in the work of assistants. This means that if you carefully set up SEO for Google Hummingbird, your efforts will not be in vain, but some things will need to be improved.

First, search engines determine the reputation and performance of your site as a whole.
For example, Google and Yandex evaluate:
page loading speed, especially when accessing from a mobile device;
strict presence of SSL certificate and https protocol;
short informative answers;
having a domain with good karma;
local business linkage;
understandable content.
Along with these requirements, which are quite familiar to us, voice snippets or selected fragments come to the fore.
Featured snippets are the answers that the search engine has selected and provided based on your query.
Featured snippets don't come out of nowhere or are generated by machines, they are part of your content and are usually highly rated by users.