Say thanks and respect to Satoshi Nakamoto, father of Bitcoin, who took the first shot of Blockchain industry. Although that is not used as he wanted, we don't know who he is, how is he now? But people will remember and prompt his name forever.
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it is not exactly bitcoin's 10th birthday but instead the 10 year anniversary of the publication of bitcoin's whitepaper. majority of people consider the day bitcoin started working and had its first block to be its "birthday" which is in a couple of months.
p.s. make sure to click that link above and take a look at the paper:
https://bitcoin.org/bitcoin.pdf