The couplet in a sonnet is the two last lines
A Shakespearean sonnet consists of 3 quatrains (4-line stanzas) followed by a rhymed couplet (2-line stanza).
Shakespearian Sonnent
You are describing the rimescheme of quatrains with alternate riming: abab cdcd efef ghgh ijij ..... An example of a poem which uses this rhyme scheme is 'How to Die' by Siegfried Sassoon.
The first eight lines are called an octave. The last six lines, which may rhyme in a variety of ways, are called a sestet.
Any kind of rhyming couplet ends Shakespearean, doesn't have to be heroic The Shakespearean (or "English" or "Elizabethan") sonnet ends with a heroic couplet.
it is a shakesperian sonnet ie. it has a specific rhyme scheme and a rhyming couplet at the end which stands out bringing a slight change in the poem's theme, tone or even setting
"On His Having Arrived at the Age of Twenty-three" is a Petrarchan sonnet, which consists of fourteen lines and a specific rhyme scheme. This type of sonnet is traditionally divided into two parts: an octave followed by a sestet.
Literary critics usually distinguish sonnets into two major families. A Petrarchan Sonnet has fourteen lines arranged into a group of eight lines, followed by a group of six (an octave followed by the sestet). A change in the point of view nearly always occurs between the two parts, this is called the volta (Italian for 'turn'). A typical rhyme scheme for a Petrarchan sonnet is ABBA ABBA CDECDE. A Shakespearian sonnet also has fourteen lines, but this time they are arranged as three groups of four (quatrains) followed by a riming pair (couplet). The usual pattern is that an idea will be developed through the three quatrains, then summed up in the couplet. Typical rhyming for a Shakespearian sonnet is ABAB CDCD EFEF GG. Shakespearian sonnets are more common, and more natural, in English because they use fewer rhymes (words which rhyme together are much rarer in English than in Spanish, French or Italian). While these are the two main forms, there are many interesting hybrids. John Donne's 'Terrible' sonnets have elements of both Petrarchan and English structure, whereas Milton's sonnets use Petrarchan rhyme patterns, but rarely have a discernible volta. The sonnets of Shelley's 'Ode to the West Wind' are neither Petrarchan nor Shakespearian - they are a new form. And many of Gerard Manley Hopkins sonnets follow no rules but their own.
Yes
A sonnet is a type of poetry (14 lines, iambic pentameter).
Rhyming couplets to a reader are clever and mischievous at times. Rhyming can keep a person interested in a poem or a phrase. They can also add to a sense of repetition, which can reinforce a specific idea or concept in a piece of poetry. They also summarise the poet's feelings and are often found in sonnets.
its an italian sonnet