Let's know something about Bitcoin.
What is it?
Bitcoin is a cryptocurrency and worldwide payment system which was invented by an unknown person or a group under the name Satoshi Nakamoto and released as an open-source software in 2009. It is the first decentralized digital currency as it does not have an administrator. The network is peer-to-peer and transactions take place between users directly.
How is it made?
Bitcoins are a reward given to you when you do an activity called bitcoin mining. They act as real money and can be exchanged for products and services. As of January 2018, its value has risen to Rs.731209.74 or 11513.88 US Dollar. If that makes you want to start mining bitcoin, save your jaws from dropping because bitcoin mining needs you to have a very high power supply unit. If you were just wondering how much then I should give you a hint that it should be around 1000W. Also, you need a good CPU and GPU along with RAM. You will need bitcoin mining software like LiteCoin, Ethereum, etc.
How are transactions done?
When a user sends bitcoins, the user designates each address and the amount of bitcoin being sent to that address in an output. To prevent double spending, each input must refer to a previous unspent output in the blockchain. Any transaction issued with Bitcoin is irreversible and can only be refunded by the person whom you sent the funds. Also, bitcoin is not anonymous. The transactions are stored publicly and permanently.
Is it safe?
Bitcoin is still experimental and each improvement brings new challenges to it. Whether it is safe or not depends upon the way you use it. The value of bitcoin also decreases and increases tremendously because it is still a young economy. Consequently, saving your money on bitcoin is not recommended at this time. Also, there is a risk of frauds.