Simile

Definition: a literary device that uses "like" or "as" to compare different things.

Example: 

Life is like a box of chocolates;

You dig through the box until you find the one you like :)

A simile may be as simple as this line.

Significance: A simile is exact and precise, and not as vague as a metaphor. The common comparisons are used to easily let the reader understand the poem. A simile is a figure of speech that allows for the reader or listener to understand a concept through the understanding of a related concept.