The part of speech which will be use to describe where, when, or the direction is going known as adverb.
The adverb of place is be directional, which indicates distant or even an object's position in relation to another object. For example- below, above, behind, between, etc.
It provides a description of how, where, when, in what manner and to what extent something is done or will be done/happen.
It is so because, it describes verbs, adjectives, or other adverbs which tells how, why, when, where, to what extent. There are only three relative adverbs - where, when, and why.
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