What is the difference between ICO and IDO?

As a crypto enthusiast, I'm curious to understand the nuances between Initial Coin Offerings (ICOs) and Initial Dex Offerings (IDOs). Could you elaborate on the key distinctions? Are there any differences in terms of fundraising process, token distribution, or regulatory considerations? How do these two models compare in terms of their overall success rates and market reception? Understanding the dynamics of both ICOs and IDOs seems crucial in navigating the evolving cryptocurrency landscape.