Protestantism is one of the three major branches of Christianity, alongside Catholicism and Eastern Orthodoxy. It originated as a movement within Western Christianity in the 16th century, led by reformers such as Martin Luther, John Calvin, and Huldrych Zwingli.
The key beliefs and practices of Protestantism include the authority of the Bible as the sole source of religious authority, justification by faith alone, and the priesthood of all believers. Protestant denominations vary widely in their beliefs, worship styles, and church structures, but they are all united in their rejection of certain teachings and practices of the Roman Catholic Church.
Understanding the history and beliefs of Protestantism is essential for gaining insights into the development of Western Christianity and its impact on world history. It also provides valuable context for understanding the diversity of religious beliefs and practices in contemporary societies.