"Christmas Tree".. Can you explain please..?

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"Christmas Tree" I found the "Christmas Tree" in most of the Christians home, and all the chrisians home i have seen the "Star" also in with the background with the lightings.. What is the reason behind the "Christmas Tree", is this the symbol of the Jesus's born or something.. or any other back ground is there.. I know very well that, there may be the very interesting background is may be available behind the "Christmas Tree" and "Star".. Can anyone able to give me the more explanations about the same.. under this discussions.. As a non-christian, i would like to know about the same, may be more people also be here, by thought about this, and hesitate to start the discussions under this topic,I have made this discussions on behalf of all the non-christians in mylot, please provide your explanations, which will defenatly help the people like me to know more about the Christianism.. All the very best.. and also thanks in advance for you to come across my discussions..