What does the See mean in the Holy See?

The term "see" comes from the Latin word "sedes", meaning "seat", which refers to the Episcopal throne (cathedra). The term "Apostolic See" can refer to any see founded by one of the Apostles, but, when used with the definite article, it is used in the Catholic Church to refer specifically to the see of the Bishop of Rome, whom that Church sees as successor of Saint Peter, the chief of the apostles.

Source: Wikipedia