ICO stands for Initial Coin Offering. They are the cryptocurrency equivalent of an Initial Public Offering (IPO) you may be familiar with from the stock market. Either all or some of a currency is sold at a certain time to raise money for development. Other rules and things apply and it varies from ICO to ICO. Be wary of ICOs, many ICOs have little to no work done yet and don’t deserve your money — please do proper due diligence before buying into any ICO.