Meter

Definition: the measurement of lines in a poem

The curfew tolls the knell of parting day,
The lowing herd winds slowly over the lea,
The ploughman homeward plods his weary way,
And leaves the world to darkness and to me.
4 lines, 10 syllabels
Signification: Syllable have the same purpose, it's to make the poem easy to read and remember.