What is an ICO (Initial Coin Offering) and why invest in one?
It's the equivalent of an IPO -
https://www.investopedia.com/terms/i/ipo.asp, basically when a stock goes to the market for the first time, they sell a certain amount of them at a fixed price.
That's basically what an ICO does aswell, but with coins, or tokens.
A more detailed explanation can be found here,
https://blockgeeks.com/guides/initial-coin-offering/It could potentially make you a lot of money, if the coin blows up, ( like ethereum did.)