Deployment - Release build ????

I read something about creating a release build when deploying your app. Can anyone elaborate on this? I copied the below from the help files. I know you can create a deployment project without doing this, but what are the advantages and disadvantages?

Thanks!


To generate a release build of your program

Select Release from the Solution Configuration drop-down list, which is on the Standard toolbar.
On the Build menu, click Build.

All of your class libraries and your exe should be build in Release mode prior to deploying. If you have anything in Debug, then you are including extra stuff in your build for the debugger, and you app will be slower.