Meter- meter is a way of measuring the line or lines of poems by using the rhythm of the words. They are also the pattern of stressed and unstressed syllables.
Example:
Shall I compare thee to a summer day
[shall-I]-[com-PARE]-[thee-TO]-[a-SUM]-[mer's-DAY]
-Shakespeare
Significance:
The significance of meter is to add importance and stress to the syllables to "highlight" the important terms.