What is imagery?

Imagery is a kind of picture. The only difference between
a real picture and an imagery is that, the real picture is a visual medium. On the other
hand, imagery evokes a picture in our brain through the connotation of words used. For
example, if we say "The grass is glittering in dawn", it creates an imagery of diamond
studded grass, that is full of dews, in our mind. Imagery is very common in poetry,
though its use is not only restricted to poetry alone. Other genre of literature, i.e.
fiction, drama, prose works also use imagery to a great extent.