Schema markup is important because it:
Improves search engines’ ability to crawl your site: With schema, you’ll be telling search engines exactly what’s on your page. This process helps especially with local businesses by helping clarify information about their business, such as what they sell and how to contact them.
Increases your site’s visibility on search pages: Schema markup adds more information to your organic results, making it more visible, attractive, and engaging to users. Schema boosts your SEO because users are more likely to click on your result than one without schema markup. With more clicks, you’ll rank higher in search results.
Boosts your visitor’s user experience: The extra information allows users to make more informed decisions, so you’ll be getting more qualified traffic and boosting conversions.
Google uses the schema markup on your page to create rich snippets in search results, which provide users with information such as reviews or product information that make them more likely to click to your site.