I know bitcoin is a digital currency that has existed for nearly 10 years in the market. Investors will use it to invest in the ico then they will be stocked and the company will have the ico program to call capital for production business ....
Bitcoin is one kind of crypto currency created by satoshi Nakamoto in 2009. After seeing the success of Bitcoin there are many other crypto currency are discovered 
. Bitcoin is world first decentralised digital currency which means it can't control by a single person or authority. Bitcoin is mainly used for money transaction because bitcoin provide world most safest and uninterrupted money transaction. And all transactions record in Blockchain. Which is known as heart of Bitcoin. Bitcoin is not globally accepted. Both Internet and electricity need for it access. In order to use bitcoin their no need of experience or age certificate. In many countries it work government to reduce unemployment issues in their country. Many economist see Bitcoin as a future currency. 