A Roman Catholic Diocese is a specific geographical area overseen by a bishop. It serves as a local church community within the larger Roman Catholic Church. Each diocese includes multiple parishes, which are smaller church communities where local worship and activities take place. The bishop is responsible for the spiritual and administrative needs of the diocese, guiding the clergy and laity in their faith. Dioceses vary in size and population, and they play a crucial role in the organization and governance of the Catholic Church at the regional level.