This is the 846th most frequent Romanian word.
esti
"Esti" means "you are" in English.
The word "ești" here is the second-person singular present form of the verb "a fi" (to be), used to describe a state or characteristic of the subject.
Tu ești foarte talentat.
You are very talented.
The word "ești" is used here to inquire about the state of readiness of the listener.
Ești gata pentru călătorie?
Are you ready for the trip?
The word "ești" introduces the subject of the question, asking about identity or responsibility.