Regarding poetry in general, what is the structure of a poem?

The
structure of a poem can refer to several kinds of "configuration." First, the
structure often refers to the physical composition of a poem. The structure
of a(a three-line poem that does not rhyme) for example, is very different than an epic (or very
long) poem (which is often written in rhyming four-line stanzas). The structure may refer also
to the meter or rhythm of the poem. Each line may have a specific number of syllables, and in
many cases, the stress or emphasis will rest on every other syllable.

For
example, William Bulter Yeats' poem, "The Ballad of Father Gilligan" has lines with a
rhythm that moves back and forth because the first line has four stressed syllables (out of a
total of eight), and the next line has three (out of a total of six). This format is repeated to
provide a sense of a lilting or swaying walk. Note that the bolded words or parts of words are
where the stress or emphasis should rest as you read:

'I have
no rest, nor joy,
nor peace,

For peo-ple die
and die';

And af-ter cried he,
'God for-give!

My bo-dy spake,
not I!'

Shakespeare often
writes with five stressed syllables (out of a total of ten total syllables per line) with the
stress on every other syllable. For example:

When, in dis-grace with
for-tune and men's
eyes,

I all
a-lone be-weep my
out-cast state...

Structure can be seen, then, in the length of each line which with
poetry such as Shakespeare's Sonnet 29 immediately above, is constructedto achieve a certain
number of beats per line, among other things. Structure along these lines also dictates whether
a line will end with punctuation (as a completed thought) called "end-stopped lines,"
or continue on to the next line, known as "run-on" or "enjambed" lines, as
is also the case with the lines in Sonnet 29.

Structure is clearly found with
the use of stanzas, which are similar to paragraphs in prose writing. The stanza usually
consists of four lines, and there is often rhyme included. The portion of Yeats' poem above is
an example of this.

All of the structural considerations fall into the
category of "form," and include other elements such as speed, arrangement, line
breaks, etc. Structure in a poem is something the author uses to put his ideas together.
Four-line rhyming stanzas are rather traditional, but there are also poems written inand ; with
these forms of poetry, structure is not based on specific rules or form.