An "Apostle" is a term often used to describe a messenger or representative, particularly in a religious context. In Christianity, the Apostles were the twelve close followers of Jesus Christ who spread his teachings and played a crucial role in the early church. They are considered foundational figures in Christianity, helping to establish the faith and share its message with others. The word "apostle" can also refer to anyone who advocates for a particular cause or belief. For example, a modern-day apostle might be someone who passionately promotes environmental conservation or social justice. In this sense, apostles are seen as leaders who inspire others to take action and make a difference.