Sweeties are small, sweet candies or treats that people like to eat.
Sweeties are usually seen as nice and enjoyable, like a little reward.
Examples:
I love to eat sweeties after dinner.
Can I have some of your sweeties, please?
She keeps a jar of sweeties on her desk.
I bought some sweeties for my friends.
I ate so many sweeties that I got a tummy ache.
The store has a whole aisle of sweeties.