There is used for naming a place, a thing, or the existence of something.

* There‘s food on the table.
* I have been there twice.

Their is used to show possession.

* That is their car.
* Their store is located near a mall.

They’re is a contraction of they are.

* I hope they’re safe. (I hope they are safe).
* They’re not attending the party. (They are not attending the party). Continue Reading