Holy Orders is the sacrament through which the mission entrusted by Christ to his apostles continues to be exercised in the Church until the end of time: thus it is the sacrament of apostolic ministry. (Catechism of the Catholic Church 1536)
The three levels of the sacrament are: episcopate, priesthood, and diaconate.
In the Sacrament of Holy Orders, or Ordination, the priest being ordained vows to lead other Catholics by bringing them the sacraments (especially the Eucharist), by proclaiming the Gospel, and by providing other means to holiness.
Wonder if you have a call for the Sacrament of Holy Orders?
If you think you may be called to the sacrament of Holy Orders, or if you are simply interested in Holy orders, please contact one of your priests and they will be happy to talk further with you about it.
You may find this link to the Diocese of Westminster’s Vocation site helpful: http://rcdow.org.uk/vocations/