"There's" is a contraction of "there is" or "there has." It indicates the existence of something.
* Example: "There's a spider in the corner!"
"Theirs" is a possessive pronoun meaning "belonging to them."
* Example: "Their house is bigger than theirs."
Here are some examples of using both words in sentences:
* "There's a new book on the shelf, and it's theirs." ("There's" indicates existence, "theirs" indicates possession)
* "There's no reason to worry, theirs is a safe neighborhood." ("There's" indicates existence, "theirs" indicates possession)
* "There's a mistake in the paperwork, but it's not theirs." ("There's" indicates existence, "theirs" indicates possession)
Remember:
* "There's" is used when you are talking about something that exists.
* "Theirs" is used when you are talking about something that belongs to someone else (plural).