What is Christmas!!

Many people are moving up and down, doing what? buying gifts to their loved ones, Families having saving and are saving Chuncks of money, here the government grants a free tax months to all workers so as to increase their pocket for Christmas.
I know in my Village its the same, at least every family now has something kept to buy meat on 24th Dec. All the streets here are giltering with Lights, all the shops and every business at least has in stock something labeled 'jule' which means Christmas. Gift shops are recieving alot of people coming in at this time than never before,dress shops are flocked with people,woooe, I know now in Uganda you have to pay a fortune to go to Ibanda district where am born!!!.
What is more amazing is the fact than all people are involved, those that read the Bible and go to church, those that are devoted to christian doctrine and those that dilute it! the Believer in Christ and those that never believe in any thing! they are all cought up in this atmosphere!!!. Whats so amazing about christmas, what is it all about, where did it originate, for whom is it commemorated???
Philosphers and thinkers of our generation, I know you can give me answers, am naive about this whole thing that is driving the nations at this particulary time. who is behind it!!!