When people say “the Anglican Church,” they can mean one of two things: the Church of England itself — the mother church of the tradition — or, more broadly, any of the independent national and regional churches around the world that share Anglican identity and are part of the Anglican Communion (for example, the Episcopal Church in the United States, the Church of Nigeria, or the Church of South India).
Each of these churches is self-governing. There is no single worldwide Anglican authority with legal power over all of them. Instead, each province runs its own affairs through its own synods, while staying connected to the wider Communion through shared liturgy, the historic threefold ministry of bishops, priests, and deacons, and the Instruments of Communion described on the Anglican Church Government page.
On the ground, an Anglican church is organised into parishes (local congregations), grouped into dioceses under a bishop, which are in turn grouped into a province — the level at which a church becomes self-governing within the Communion.