The word Advent is from the Latin word Adventus which means "coming".
Advent with a capital A usually refers to the "coming of Christ into the world" or to the liturgical period preceding Christmas.
In the 8th century Advent was observed not as a liturgical celebration but as a time of fast and abstinence.
In the 9th Century the Catholic Church designated the first Sudnay of Advent the beginning of the Church year.
On each of the four Sundays preceding Christmas Day in Roman Catholic Churches and many other Christian Churches - an Advent candle is lit as part of the weekly mass.
Watch out fore Christmas Trivia every day until Christmas Eve.