This acronym stands for Initial Exchange Offering. It is a transaction carried out by exchange platforms such as Binance and Bittrex. IEOs are only available to registered users of the exchange.
In many ways, IEOs work similarly to ICOs with a fixed amount of tokens being available for sale at a fixed price. The exchange platforms put their reputation on the line when they accept a new cryptocurrency. The registered investor on an exchange does not need to send their personal information to a company (KYC).
For example, the BitTorrent Token BTT cryptocurrency was successfully launched on the Binance LaunchPad platform.
Still, it is necessary to do your own research (DYOR) before investing in an IEO. The price often increases at the launch of the IEO before decreasing when the hype has passed.