This is the 98th most frequent Italian word.
queste
"Queste" means "these" in English.
In this sentence, 'queste' is used as a demonstrative pronoun to point out specific objects, specifically apples.
Queste sono le mele che ho comprato ieri.
These are the apples I bought yesterday.
Here, 'queste' acts as a demonstrative pronoun referring to the people being spoken about.
Non conosco queste persone.
I don't know these people.
In this case, 'queste' is used to specify particular shoes that are visible in the shop window.