The Pope is the head of the worldwide Catholic Church. His residence is in an independent state called Vatican City which is found in Rome, Italy. Catholics believe that the Pope inherits his authority from St. Peter who they believe was the first Pope. He acts as the governing head of the Catholic Church. He also gives instructions and teachings that are expected to be followed by the members of the Catholic faith.
Pastors are leaders found in protestant churches. A pastor is in charge of his church and is responsible for preaching, teaching and giving guidance to his congregation. He is also the one who is in charge of ceremonies such as weddings and funerals. Unlike the Catholic Church many female pastor are found in protestant churches.
Priests are elders in the Catholic Church who are responsible for taking care of their church. They are responsible for teaching, preaching, counseling and carrying out the various rites, ceremonies and sacraments. Priests are not allowed to get married. This sacrifice is made as a way of showing their total dedication to doing God's work.
In the Roman Catholic, Anglican and Orthodox Churches, bishops are senior priests who are in charge of the various branches of their church within a certain geographical area. They are the ones who carry out important ceremonies such as ordination and confirmation. In these churches bishops do not marry.
The title of bishop is also given in many protestant churches. The functions and dress code however tend to differ. In protestant churches bishops are allowed to marry.