What is Urban and Regional planning?

Answer 1

They are both branches of land use planning:

http://en.wikipedia.org/wiki/Urban_planning
http://en.wikipedia.org/wiki/Regional_planning

__________

Answer 2

"The discipline of distributing urban or suburban functions spatially, in terms of activity patterns of people in the physical setting. This includes the physical facilities or improvements to the land which are made to accommodate these activity patterns. Urban or suburban functions addressed in planning are broad, encompassing land use; transportation; housing; open space and recreation; public and human services; and conservation of environmental and heritage resources."

http://www.co.fairfax.va.us/dpz/comprehensiveplan/glossary/uz.htm

"Regional planning is a branch of land use planning and deals with the efficient placement of land use activities, infrastructure and settlement growth across a significantly larger area of land than an individual city or town."
http://experts.about.com/e/r/re/regional_planning.htm