Advent Candles Meaning?

What is the meaning of Advent candles?
Advent is the four weeks leading up to the birth of Jesus, as celebrated in the Catholic church. Advent is considered as a time of preparation or anticipation for the birth of Christ.

What do the four candles represent when lighting them for Advent?
I know that they stand for the season of Advent but why the colors of the candles are purple and pink?

Advent Wreaths are a tradition used by Christians to mark the passage of the 4 weeks of Advent. Its usual form is of a horizontal evergreen wreath holding four candles. Starting during the first week of Advent, a candle is lit while prayers are said.

An advent wreath includes five candles. There are four candles, one for each Sunday leading to Christmas and a fifth candle for Christmas day. The four Sunday candles are usually tapers. There are variations in the coloring of the candles, often there are three purple and one pink candle.

The four candles represent the four weeks of Advent. A tradition is that each week represents one thousand years, to sum to the 4,000 years from Adam and Eve until the Birth of the Savior. Three candles are purple and one is rose. The purple candles in particular symbolize the prayer, penance, and preparatory sacrifices and goods works undertaken at this time. The rose candle is lit on the third Sunday, Gaudete Sunday, when the priest also wears rose vestments at Mass.

The candles remind us of the approach of Christmas. Originally, the advent wreath was a Catholic tradition, but it has spread through much of the Christian churches.