This is the 31st most frequent Spanish word.
hay
"Hay" means "there is" or "there are."
In this sentence, 'hay' expresses the existence of something, indicating that three apples are present on the table.
Hay tres manzanas sobre la mesa.
There are three apples on the table.
Here, 'hay' is used in an interrogative form to ask about the presence of someone at home.
¿Hay alguien en casa?
Is there anyone at home?
In this instance, 'hay' demonstrates the lack or absence of something, specifically any problems.