The "Constitution on the Sacred Liturgy," known as Sacrosanctum Concilium, is one of the key documents from the Second Vatican Council, which took place from 1962 to 1965. It emphasizes the importance of the liturgy in the life of the Catholic Church and encourages active participation by the faithful. The document outlines the need for reform in the liturgical practices to make them more accessible and meaningful to the congregation. This constitution also highlights the role of the Mass and the sacraments, affirming their significance in spiritual life. It calls for the use of local languages in the liturgy, promoting a deeper understanding and connection to the worship experience. Overall, it aims to foster a more profound appreciation of the sacred rites within the Church.