I learnt that you use the expression "there is/are" when you mention new information.
Example:
- There is a cat on the wall.
But I sometimes encounter phrases like
There's this great bakery that opened up recently.
There's this weird smell in the kitchen.
Is there any difference between the two sentences above and the ones below?
There's a great bakery that opened up recently.
There's a weird smell in the kitchen.