There, their, and there are all pronounced the same way, /ˈðeɚ/, but they are different words with different meanings and uses.
There is an adverb that means "to, into, or in that place" or "at that location."
Their is an adjective that means "relating to or belonging to certain people, animals, or things" or "made or done by certain people, animals, or things." It is the possessive form of they.
They're is a contraction of the words "they are."
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