This is the 17th most frequent French word.
la
Feminine singular definite article: "the."
In this sentence, 'la' is used as a definite article for a feminine singular noun, meaning 'the'.
La maison est grande.
The house is big.
Here, 'la' is a direct object pronoun referring to a singular feminine thing or person, meaning 'her' or 'it'.
Je vais la voir demain.
I will see her tomorrow.
In this context, 'là' means 'there', indicating a location.