It was called advent because it signaled approach of the celebration. Advent is also associated with the birth of Christ and his entrance into the world in the incarnation. Finally, advent is used to refer to Christ s Second Coming.
Conifers are green all year-round and never lose their needles or leaves like the other trees do.
We also recognize the green color of evergreens as a sign of life like in the spring after a long winter. The evergreen represents the eternal life that we can have through a relationship with Jesus. There was a man sent from God, whose name was John. He came as a witness to testify to the light, so that all might believe through him. He himself was not the light, but he came to testify to the light.