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Conjunction
Beginning a sentence with and or other coordinating conjunctions is considered incorrect by classical grammarians arguing that a coordinating conjunction at the start of a sentence has nothing to connect, but use of the word in this way is very common. The practice will be found in literature from Anglo-Saxon times onwards, especially as an aid to continuity in narrative and dialogue. The OED provides examples from the 9th century to the 19th century, including one from Shakespeare’s King John: “Arthur. Must you with hot Irons, burne out both mine eyes? Hubert. Young boy, I must. Arthur. And will you? Hubert. And I will.” It is also used for other rhetorical purposes, especially to denote surprise
Used simply to connect two noun phrases, adjectives or adverbs. [from 8th c.]
Simply connecting two clauses or sentences. [from 8th c.]
Introducing a clause or sentence which follows on in time or consequence from the first. [from 9th c.]
Used to connect certain numbers: connecting units when they precede tens (not dated); connecting tens and units to hundreds, thousands etc. (now often omitted in US); to connect fractions to wholes. [from 10th c.]
(literary) Used to connect more than two elements together in a chain, sometimes to stress the number of elements.
Connecting two identical elements, with implications of continued or infinite repetition. [from 10th c.]
Introducing a parenthetical or explanatory clause. [from 10th c.]
Introducing the continuation of narration from a previous understood point; also used alone as a question: ‘and so what?’.
(now regional or somewhat colloquial) Used to connect two verbs where the second is dependent on the first: ‘to’. Used especially after come, go and try. [from 14th c.]
Introducing a qualitative difference between things having the same name; "as well as other". [from 16th c.]
Used to combine numbers in addition; plus (with singular or plural verb). [from 17th c.]
And is often omitted for contextual effects of various kinds, especially between sequences of descriptive adjectives which can be separated by commas or simply by spaces
