Is IDO the same as IPO?

Excuse me, but could you please clarify the distinction between an Initial Dex Offering (IDO) and an Initial Public Offering (IPO)? Are they essentially the same process, or do they differ significantly in terms of their purpose, process, and the type of investors they attract? I'm interested in understanding the nuances between the two, especially in the context of cryptocurrency and finance. Thank you for your time and assistance.