NoData vs Background: What is the difference? When to use one or another?

Discussion created by msilin-esri-cis-ru-esridist on Apr 26, 2012
Hi All,

Trying to understand the difference between the NoData and Background values. For instance, the 'Copy Raster' tool (just as an example) allows to specify both as optional parameters - should I choose one or another? Or may be both? I mean, normally people tend to remove those values from display by setting them to No Color in the Raster layer display properties. Thus, why would I want to distinguish those if they are useless anyways. Or may be not - do you ever use these in your analysis? Furthermore, how does ArcMap handle those by default - does it hide NoData; does it display background?
Just trying to understand this topic better. So, any thoughts, ideas, and opinions are welcome!