a website visitor leaves a site after 5 minutes, but returns 15 minutes later and makes a purchase, that is considered:

This scenario is an example of "returning visitor behavior." When a website visitor leaves a site after a certain amount of time and returns later to engage more meaningfully, such as making a purchase, it indicates that they have retained interest in the site or the products offered.

Returning visitors are crucial for e-commerce and online marketing because they often represent a more engaged audience that has already shown interest in a brand or product. Understanding this behavior can help businesses tailor their marketing strategies, recognizing the importance of remarketing and follow-up communications to bring customers back to complete their purchases.

This also illustrates the importance of tracking user engagement over time and emphasizes the need for effective user experience design to encourage visits and repeat visits, ultimately leading to conversions or sales.