What is a creative brief?

Expressing the thoughts in a different way but should be easily understandable to other peoples too.

In my concept 

Think Out of Box..

Because Every one have different mind set.  

Soo Think Out of Box..

A two liner (can be a paragraph long too) stating your artwork requirements from the agency.

The brief should cover important points such as CMYK ratio of your logo for instance and should  be timebound.