I live in Adelaide in South Australia, and chat on several Internet Relay Chat networks, using the nickname of "eagles" - which is an oblique reference to Isaiah's writings (specifically chapter 40 verses 28-31).
Thinking it through later, here is a very short and concise answer - probably shorter and more concise than I gave the questioner.
A Mormon is more correctly described as a member of the Church of Jesus Christ of Latter-Day Saints.
The name 'Mormon' comes from a book that they regard as scripture, called the 'Book of Mormon'. Initially the expression 'Mormon' was a term of derision from other people, but eventually it has become accepted by them and they now use it themselves.
The Latter-Day Saints are more correctly described as a religion - not a Christian denomination - which was officially organised under United States law in April 1830 by a young chap by the name of Joseph Smith. Joseph claimed that he was called by God to be a prophet back in 1824 when he experienced a vision in which he claimed to see Jesus Christ and God the Father.
Some years later, after Joseph was shot in a gunfight in Carthage (Illinois), his successor as head of the church - Brigham Young - took Joseph's followers westwards across the plains, climbing through the Rocky Mountains into the area surrounding the Great Salt Lake.
Known as Utah Territory after the tribe of 'Indians' known as the Utes, Brigham founded a sizeable empire which had to agree with the federal government of the United States to give up some of its religious excesses in order to become a state in the union. They have maintained a continual succession of prophets since that time.
Their teachings are different from Christian ones in a number of ways. After looking at the startling claims on this site of ongoing changes to their scriptures, you may like to take this link here to read further about the church which claims to be God's ONLY true church, which He supposedly restored through a 100% accurate prophet.