This four-letter domain is distinctive and easy to pronounce and spell. It sounds like "ducks", which leads to obvious branding opportunities.
As an abstract name this could almost anything, including a physical product (e.g. cleaning, pharmaceutical) website or app (social, health).
The name "duxs" has only four characters and only one syllable. One-syllable names are extremely rare and very sought after. One syllable names are used by established brands like Nike, Shell and Path.
This domain was first registered in April 2005. Older domains have an advantage when ranking in search engines.
Duxs.com is a dot com domain. Dot com domains are the most valued domain extension in the world, famously used by websites like facebook.com. When most people think of a website, they think of a dot com.