§1. As a consecration of the whole person, religious life manifests in the Church a wonderful marriage brought about by God, a sign of the future age. Thus the religious brings to perfection a total self-giving as a sacrifice offered to God, through which his or her whole existence becomes a continuous worship of God in charity.
§2. A religious institute is a society in which members, according to proper law, pronounce public vows, either perpetual or temporary which are to be renewed, however, when the period of time has elapsed, and lead a life of brothers or sisters in common.
§3. The public witness to be rendered by religious to Christ and the Church entails a separation from the world proper to the character and purpose of each institute.
Source: Code of Canon Law (Vatican.va)