The Apostles were a group of twelve followers chosen by Jesus Christ to spread his teachings and establish the early Christian church. They played a crucial role in the formation of Christianity after Jesus's crucifixion and resurrection, sharing his message and performing miracles. Each Apostle had a unique background and personality, with notable figures including Peter, who became a leader among them, and Judas Iscariot, who betrayed Jesus. The Apostles traveled extensively, preaching and converting many to Christianity, and their teachings are foundational to the New Testament of the Bible.