Lines

Definition: Line is a unit of language into which a poem or play is divided into, a single line of words in a poem, but still follows the rules of grammar. Contains rhyme, rhythm, assonance, alliteration and other devices of poetry.


Example: 
I'm just a girl
Like many other girls
On this big world
But I know that
I'm the perfect one for you
And there is no other 


Significant: The lines make up poem, without line, there is no poem, that's why it so important. Although there is one line, but it contains the important devices that make up poems.