Definition:
a conjunction is a word that is used to connect phrases, clauses, or sentences. In this case, 'neither' is used as a conjunction to link two negative ideas or sentences.
Examples:
'She isn't coming to the party, and neither am I.'
'Neither the teacher nor the students were prepared for the quiz.'
Tips:
Neither' can also be followed by a third option, for example 'neither A nor B, but C.'