Imagination, also called the faculty of imagining, is the creative ability to form images, ideas, and sensations in the mind without any immediate input of the senses (such as seeing or hearing). – Wikipedia.
Our imagination combines desires, previous experiences, lived sensations, also our fears and hopes. The imagination transports us to new places that probably we would like them to exist.
We will only be aware of the importance of the imagination if we imagine that we did not have imagination. I firmly believe that if we did not have this incredible capacity, we would not be human, humanity would not exist.