It was created as a way for users to take control of their money, instead of trusting the financial system. It also happens to be faster then the way banks transfer money. It was also used as a way to transact while anonymous. society needed an alternative to the regular financial system through which people could trade. When Satoshi Nakamoto invented Bitcoin peer-to-peer transaction system, society got the best alternative yet. Now, everyone can try his luck with day-trading, mining, etc. Important part is that today we have stabile digital currency that is used all over the world for transactions of all sorts. Most of the online traders use Bitcoin nowadays and even some of the biggest networks included Bitcoin as a valid method of payment