Structured data is essentially the data talking to search engines about what the page contains and its topics. This goes in favour of search rankings as search engines will now have a better understanding of what is included on the page. Adapting the way in which search results are displayed is also a huge advantage, which is another benefit of structured data highlighted by schema and rich snippets.
Schema and rich snippets help display search results in a more thorough manner, as search engines have additional information due to the structured data. When using a search term, a rich snippet will highlight more information about the page and therefore will most likely lead to more clicks and visits for the site as the result naturally stands out more to the user.