Crypto Jargon: What is an IEO and an IDO?
Initial Exchange Offering, or IEO for short, is a way to fund your project (or to acquire a token) usually through an initial offer to market. Exchanges ask projects to provide enough documentation to be approved and this tends to reduce risk (crypto is highly risky anyway).
Going through KYC and AML processes, white paper evaluation, tokenomics are just some of the requirements that need to be met in order to have your project listed as part of an IEO. Also usually exchanges charge fees to list your project (and also because of the required processes your project needs to undergo that I mentioned) and liquidity is not immediately available.
On the other hand, the newest form of fundraising is the IDO, Initial DEX Offering. DEX means Decentralized Exchange. Since DEX are completely decentralized, the process to evaluate your project follows the same approach. Community is responsible for evaluating it: your white paper, your staff (not exactly a KYC but LinkedIn or other social profiles), technical architecture, etc, all counts towards making a good launch. Also DEXes don’t charge fees and your liquidity is almost immediately available.