This is the 712th most frequent Finnish word.
asiakkaita
"Customers" (partitive plural form of "asiakas").
Here, 'asiakkaita' is the partitive plural form of 'asiakas', used to indicate an indefinite, non-specific quantity of customers.
Meillä on monta asiakkaita tänään.
We have many customers today.
In this sentence, 'asiakkaita' is in the partitive plural form because the action (helping) pertains to a part of the group of customers.
Tulen auttamaan asiakkaita kaupassa.
I will help customers in the store.
'Asiakkaita' is in the partitive plural form, functioning in the context of a continuous or indefinite aspect of the action.