The etymology of this word is Greek, "Bet him" and its meaning is Sent. First, the difference between a Disciple and an Apostle must be raised (although both terms are related at the same time), the first being used to refer to a subject who follows a doctrine or thought, this is seen as an apprentice, therefore it needs from a teacher or leader to show you the way and guide you toward your development. For his part, the Apostle is a preacher in the Christian religion, the main apostles being the twelve disciples that Jesus Christ sent to preach the Gospel throughout the world.
At the same time, if any individual truly feels a faithful follower of Christ, they experience the desire to spread his word, although more strictly some see it as a duty, while being an honor, to preach the Gospel. The apostles transmit to the world the biblical doctrine that Jesus left while he was on earth, in addition to the Christian faith and the love of God, that is, of his entire Redemptive mission. However, it must also be clear that Jesus Christ himself was an apostle, that God, his father sent into the world to save us from our sins, but it is more common when it refers to the 12 apostles that the Savior himself chose to transmit the message. that he left, these were:Pedro, Andrés, Juan, Jacobo, Santiago, Felipe, Bartolomé, Tomás, Mateo, Judas Tadeo and Judas Iscariot.
The real apostle is that God himself chooses for his mission, and not the one who names himself in this way, it is said that God sees in his apostles the following qualities or characteristics: love, self-denial, humility, righteousness, availability and faith. The apostles are also known as evangelizers, because they are messengers of good news or that is the closest thing to its meaning in Greek.
Actually, in general terms, all those propagated by any ideal, whether political, religious, social, etc. are called apostles. But based on a faithful belief of this towards herself, thus being able to strengthen her trust with property.