What do you mean?

If you ask how BTC is generated, it's done through a process called "mining".

If you ask why people use it, it's probably because it has something to do with the next gen of value transfer: rocks--> pretty rocks --> paper --> credit cards --> Bitcoin (blockchain technology)

If you ask why the price is higher ... likely tied to electricity costs of securing the network through mining, but it'd be a better question for Tone Veyes on YouTube.