Cyburbia is a friendly big tent, where we share our experiences and thoughts about urban planning practice, the built environment, planning adjacent topics, and anything else that comes to mind. No ads, no spam, and it's free. It's easy to join!
Urban design is not a profession or a pursuit, that in my opinion, can be defined in any one simple way. If you are looking for a more concrete answer, my UD prof always used to say that Urban Design is What Urban Designers do. It just can't be simplified to say that it is a little larger scale than Architecture and a little smaller than planning, it is more than that. Designeres find themselves working on one small site one week, and on a streetscape the next. I have worked on busstops and lots of other stuff, too. The question is really loaded, it is maybe a bit too romantic for me to say, but exactly what an Urban Designer is, you almost have to define it yourself. It is about formulation of a community, an aesthetic, a function, and a place. As far as a concrete job, you'd probably end up as a psuedo planner in a consulting firm or an architecture firm. Read books like "Common Place" and "Downtown Urban Design" they are helpful.