It is a VIRTUAL/DIGITAL/INTERNET MONEY that can be exchanged to fiat currency thru Coinbase.com if you are in the USA and other supported countries. In the Philippines we have Coins.ph. Others can use Xapo, WirexApp, etc. Coinbase, Xapo, etc. are just similar to PayPal but exclusive for CryptoCurrency.
You said your have heard and read about it. It seems it is trending. Therefore, it does exist but it is too risky. It is my personal assessment for I never ever take the risk of investing money in any form of business investment. If you are interested you can search it more from the Internet.