Definition of metaphor:

When something is hidden make comparison between two things that are unrelated, but which share some common characteristics  is a image of speech  of metaphor.Moreover , a resemblance of two contradictory or different objects is made based on a single or some common characteristics. To be more easy, when you portray a person, place, thing, or an action as being something else, even though it is not basically that “something else,” you are speaking metaphorically.