Simile and Metaphor

Similes and metaphors are closely related types of figurative language. Both are used to compare one object to another. Their only difference is that simile requires you to use "like" or "as" to compare where as a metaphor you do not use "like" or "as".
The dictionary definition of Simile is, "A figure of speech comparing two unlike things that is often introduced by 'like' or 'as'" and the dictionary definition of metaphor is, "a figure of speech in which a word or phrase literally denoting one kind of object or idea is used in place of another to suggest a likeness or analogy between them".
Similes and metaphors are very important components of figurative language. It is used to add power to a sentence.
For example, look at the following two sentences: "the man was small", "The man was as small as an ant". Obviously the second sentence was better. Similes metaphors add more description to a piece of literature to help you understand more.

Here are 2 more examples. The first poem is an example of simile and the second poem is an example of a metaphor. The examples are highlighted to help show you where they are.

Flint

An emerald is as green as grass,

A ruby red as blood;

A sapphire shines as blue as heaven;

A flint lies in the mud.

A diamond is a brilliant stone,

To catch the world's desire;

An opal holds a fiery spark;

But a flint holds a fire.

Christina Rossetti 

 Simile

Hope

Hope is the thing with feathers
That perches in the soul,
And sings the tune--without the words,
And never stops at all,

And sweetest in the gale is heard;
And sore must be the storm
That could abash the little bird
That kept so many warm.

"I've heard it in the chillest land,
And on the strangest sea;
Yet, never, in extremity,
It asked a crumb of me."

                                                                       Emily Dickinson

Metaphor