and

Used to introduce a consequence or result of an action.

"Work hard and you will succeed."

Used to indicate that one action or event follows another.

"He stood up and left."

Used to introduce an additional, often surprising, comment or question.

"And what about us?"

Used to connect two identical words to emphasise quantity or duration.

"Hours and hours passed."

Used to connect two or more words, phrases, or clauses.

"Tea and biscuits, please."