What Does User Experience Design (UXD) Mean?

User experience design (UXD or UED) is the idea of designing software products and systems to be useful to a set of end users.

Techopedia Explains User Experience Design (UXD)

As an example of UXD, consider how the standard user interface has evolved over the last four or five decades. Essentially, the technology has gone from large mainframe computers controlled by alphanumeric keyboards to small-screen devices that use a touchscreen interface. However, in the last 10 years, the interface field has evolved to include items like the wearable Google Glass, along with the promise of three-dimensional physical control panels, such as bendable touchscreen interfaces.