This is the 636th most frequent Hungarian word.
vannak
"Vannak" means "they are" in English.
Here, 'vannak' is used to denote existence or presence of many houses in a specific location.
Sok ház vannak ezen az utcán.
There are many houses on this street.
In this case, 'vannak' indicates the location or presence of the children within a given area.
A gyerekek az udvaron vannak.
The children are in the yard.
Here, 'vannak' implies the existence of a group of people possessing a certain characteristic or preference.