During is a preposition, which is a type of word used before a noun or pronoun to relate it to another part of the sentence, especially to express a relationship based on space or time.

Is during a preposition or conjunction?

During is a preposition; while is a conjunction. A preposition should be followed by a noun or pronoun. A conjunction should be followed by a clause.

Is during a preposition of time?

For, During, and While are three of the most common prepositions used in time expressions.