Bitcoin is the first decentralized digital currency that can be sent through the internet.
It all started way back in 2009 when an unknown person using the alias Satoshi Nakamoto issued a whitepaper that describes how a peer-to-peer electronic cash system can be implemented in our life.
Bitcoins are coins that can be transferred from one person to another in just a few minutes. In view of the fact that such transactions do not require any intermediaries, the fees are much lower. Usually, Bitcoins are stored in cold wallets, which makes it almost impossible for fraudsters to get their hands on them.
Bitcoins are generated by miners. When a miner solves a task he/she gets a reward in Bitcoins. The amount of work that needs to be done by miners is adjusted by the network and difficulty increases in time. The amount of Bitcoins is finite. In fact, there are only 21 million Bitcoins that can be mined in total.
To make Bitcoin an electronic cash system, we have to be sure that it is legit and secured. It is done by gathering and storing transactions in blocks. The chain of such blocks is named - Blockchain.
If you want more information, please check this article: What is bitcoin?