What are the different types of ICO?

Could you elaborate on the varying categories of Initial Coin Offerings (ICOs) that exist in the cryptocurrency market? I'm particularly interested in understanding the distinctions between utility tokens, security tokens, and other types of ICOs. Could you explain the key characteristics of each, their regulatory considerations, and how investors should approach evaluating them? Additionally, are there any emerging trends or innovations in the ICO space that investors should be aware of? Your insights would be greatly appreciated in helping us navigate this dynamic and rapidly evolving market.