Bitcoin is the first well-known and most used cryptocurrency. It is a digital currency and is only available online. It was first introduced in 2008. The main reason for its invention was to make it safe and unhackable for investors. It works on a public ledger called 'Blockchain.' In this process, all the transactions are added in the form of blocks to avoid any kind of scam. With the entry of each block, it appears on a computer system that prevents burglary and makes the user aware of validation or transaction. So, it is a trustworthy system where you can keep money without any fear of stealing.