ICO is a place to make money in the modern era, because we only invest in ICO and wait until ICO we invest in exchange and the price increases and we sell to get a big profit, compared we invest in elsewhere.
ICO stands for Initial Coin Offering. It means that if we will invest in public for the first time, it offers us to buy a coin to change it for funds. It means someone offers investors some unit of new cryptocurrency or crypto-token for in exchange against cryptocurrencies like Bitcoin or an Ethereum. They sell their crypto for an exchange of ethereum or bitcoin.
Technically, it can be in exchange for anything, as you can send fiat to many of the ICOs. I would only use ether because at least you have a smart contract.