Why was the printing press essential to the succes of protestant reformation

The printing press was essential to the success of the protestant reformation as it helped with the spreading of opinions and ideas. Because at that time the Church was at power, people often listened and were influenced by most of the pope's ideas which led to corruption. However, with the printing press, people were able to write books and gain more knowledge from elsewhere rather than depending on the church for information. It allowed for people to eventually question their faith in the church which helped them break free from corruption.