Hi Luna:
Well, in short....the Story of Fatima is what the Church calls private Revelation. This means that Catholics are not required to believe it. However, the Church teaches that private Revelation can strengthen our faith in the public Revelation of Jesus Christ.
At Fatima, three young children had visions of the Virgin Mary. The Virgin Mary shared some visions of the future with them. Evidently, the visions predicted the problems that the Church would have during World War II and also with the Communist gov'ts. The Pope interpreted the 3rd part of the last secret of Fatima to have been a prediction of the assassination attempt on his life and the last seer of Fatima (St. Lucia who died a few months ago) seems to agree with this interpretation.
So, that in a nutshell is what Fatima is all about. The Church obviously approved this private Revelation as being consistent with the teachings of the Catholic Church (public Revelation). One of the main messages of the Virgin Mary at Fatima is that Christians and mankind in general need to pray more and seek forgiveness for the sins of the World.
Jeff Schwehm
www.catholicxjw.com