Since Bitcoins is a decentralized currency, they aren’t printed, like rupees, they’re produced by people, and big companies, running computers all around the world, using software that solves mathematical problems. Bitcoins are mined using computing power of distributed network. This network also processes transaction made using Bitcoin. Since the Bitcoins are mined on the basis of computing power, so they take time to be generated. To keep it valuable, it has been stated that only 21 million bitcoins can be created by miners. By the year 2140, all the bitcoins will be created. Around the world, thousands of computers with very high computing power are processing transactions and securing the network by solving complex mathematical calculations and are collecting new bitcoins in exchange.
