There, their and they’re are commonly confused in English, as they sound the same.
There is an adverb which refers to places:
The shop you need is over there.
We also use there to say that something exists:
There is a large oak tree outside the hotel.
Their is a possessive determiner which means ‘belonging to them’:
Their house is very small, isn’t it?
They’re is a shortened form of ‘they are’:
They’re too young to have a holiday so far away from home.
