What is the Apostasy?:
When Jesus Christ lived on the earth He organized His church and called apostles to lead and teach the people. Christ gave His apostles the authority (called the priesthood) to act in His name, such as to perform baptisms.After Christ's death, resurrection, and ascension into heaven, His apostles continued to teach His doctrine and direct His Church through revelation from Christ. After the death and martyrdom of Christ's apostles no one with Christ's priesthood remained on the earth. There was a general falling away from the truth and Christ's church and authority were taken away. This is called the great Apostasy.
Christ Restored His Church:
This apostasy lasted for hundreds of years until Christ called a new prophet, Joseph Smith, to whom He revealed His doctrine and gave His authority, the priesthood, to act in His name. (Also see What is a Prophet?) Christ directed Joseph to organize and restore His church in these latter days. This is called the restoration because Christ's church, authority, and gospel were restored (returned) to the earth.Joseph Smith's account of being called of God, including his vision of God the Father and Jesus Christ, can be read in Joseph Smith's History.

