The Roman Curia is the ensemble of the dicasteries and bodies that assist the Pope in the exercise of his supreme pastoral office for the good and in service of the Church throughout the world and of the particular Churches, assisting in the maintenance of the unity of the Faith and the communion of the People of God and in the promotion of the proper mission of the Church in the world.
There are a number of departments of the Roman Curia, each with their own responsibilities and competencies. The most important parts of the Curia are the Secretariat of State and the various Congregations. Then, there are Pontifical Councils and Pontifical Commissions.
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