[Dovecot] Namespace Prefix Tutorial?

[Marc Perkel]

On 10/8/2012 10:59 AM, Robert Schetterer wrote:
> Am 08.10.2012 18:23, schrieb Marc Perkel:
>> I'm trying to grasp the namespace and prefix stuff and looking for a
>> good tutorial page that explains what it is and how to use it.
>>
>> Thanks in advance
>>
> look
>
> http://wiki2.dovecot.org/Namespaces
>

I've read that but it doesn't tell me what a prefix is or what a 
namespace is. I'm having a hard time grasping the overall concept.