The Catholic Church is the Church that Jesus Christ founded (Mt 16:18-19) as Fr. Mike Schmitz explains in the above video.  This Church has a visible structure that started with the Apostles (Eph 2:20) who then were succeeded by the bishops (Acts 1:20, 25-26).  The Church of the New Testament is hierarchical (Eph 4:11) and has bishops, priests, and deacons (1 Tim 3:1, 8; 5:17; and Acts14:23), who were entrusted with the teaching of Jesus Christ (2 Tim 2:2). The Church has the authority to teach on behalf of Christ (Lk 10:16) because Jesus delegated this power to His Church (Mt 28:18-20), which also has the authority to legislate and discipline the faithful followers of Christ (Mt 18:17-18). The Church is necessary to settle disagreements about what Jesus taught in order to preserve Christian Unity (Eph 4:3-6; 1 Cor 1:10; Jn 17:17-23; and Rom 12:5) and the truths that were revealed to us by Jesus Christ (1 Tim 3:15), which affects our salvation.