Bitcoin has value because it is the fastest, cheapest, and most secure way to send money to anyone. Unlike fiat currencies, bitcoin easily lets you pay people who use other kinds of money. And it does not require trust in a third party. That is the most powerful idea in money in at least 100 years.
Secuirty depends solely on the user which can be a good thing but may also lead to theft.
Cheapest for sure though. 0% fees often!