Cycle Render and Texture on one Face


I’m a beginner, sorry if my question is not relevant.

Imagine a Cube with Blender 2.62 and the Cycles Render. Is it possible to set a texture on one face of the Cube only?
When I set a Material, the whole object is mapped. However I’d like to paint only one face



Give that face its own material


UV unwrap your object and apply the texture only to the faces you want