used to join coordinate sentence elements of the same class or function, expressing addition or combination
She was cold and hungry
John and I
used to express the addition of numbers
Three and three make six
three hundred and seventeen
used to link clauses to express additional information, consequence, etc
She's ill and can't travel
Water the seeds and they will grow
used to join repeated words expressing continuation or progression
They ran and ran
It grew larger and larger
informal used instead of to after come, go, run, try, and stop
Come and look at this
archaic = if1
and/or
used to indicate that two words or expressions may be taken together or individually
[Old English and, ond]