What is a sonnet poem and a assonance, give a defination to each and give two exapmles of the poems

A sonnet has 14 lines and is written in iambic pentameter. It has a specific rhyme scheme and a "volta" or a specific turn. (Ex - Shall I compare thee to a summer’s day?" - William Shakespeare "I carry your heart with me)

An assonance is the repitition of the sound of a vowel in nonrhyming stressed syllables near enough to each other for the echo to be discernible (ex - penitence, reticence).