If you were to look at a web page, it should be fairly easy for you to pick out the most important information from that page. As advanced as search engines have become, it can still be a challenge for them to do the same. Structured data gives search engines a helping hand by directly telling them what is on your webpage.
Implementing structured data on your website gives search engines a much better understanding of the content on each page. This can allow search engines to provide you with a whole bunch of different benefits, such as improved SEO or a different way of displaying your content on the Search Engine Results Page (SERP).