Which property in AEM is mainly associated with improving SEO through URL format?

The property in AEM that is primarily associated with improving SEO through URL format is the Vanity URL. A Vanity URL allows you to create a user-friendly URL structure that is easy to read and remember, which can significantly enhance search engine optimization (SEO). When URLs are clear and descriptive, they are more likely to be clicked by users and understood by search engines, contributing to better rankings.

For instance, instead of having a long and complex URL that may include an ID or a series of numbers, a Vanity URL might reformat it to something like "www.example.com/products/shoes." This not only benefits users by making the URL more intuitive but also helps search engines index the content more effectively, as the terms in the URL can give context about what the page is about.

The other options, while important in their respective contexts, do not directly pertain to enhancing SEO through URL structure in the same effective way. Realm URLs and Export Configurations focus more on security and data management respectively, while Digital Asset Links are related to linking digital assets rather than specifically optimizing URLs. Hence, Vanity URLs stand out as the key feature for improving SEO in AEM through effective URL formatting.