Bitcoin is the cryptocurrency conducted on the public ledger, “blockchain.” Transferred digitally, this exists just on internet. Very much like gold, bitcoin has monetary value whereas being the commodity, but still it is own currency. It’s decentralized as well as not managed by one single entity, but group of people that process transaction, named miners. It means this currency isn’t subject to any government regulations when spent or traded, and you do not need bank to use this currency.
Miners are totally in charge of ensuring that bitcoin transactions that are made by the users are been recorded & legit. To explain in simple terms, they do it by grouping each new bitcoin transaction that is made during the set period of time in a block. When block is made, this is added to chain that gets linked together with the complex cryptography. The blocks chain is a public ledger, and complexity is what the currently protects our transactions.
Is This Infinite?
No, this system is made to top out 21 million bitcoin and at that point of time, bitcoin can stop getting released. Many people think it can be around 2140. You will see miners do not build blocks only from kindness. When miner builds the block, they need to solve series of math puzzles. Suppose they are able to do it before other miner, they will unlock predetermined amount of the bitcoin they will keep—prize for being quick and smart.