2000 Dodge Durango Squeaking

A couple days ago my Durango started making a loud squeaking noise. It does it at random times and I can't figure out exactly where it's coming from, but it's somewhere under the hood. I haven't tried to do anything yet because I'm not sure what to look for. Any ideas on what it might be and what to do would be great. It's getting really annoying, not to mention it's a little embarrassing.

Thanks