What is the difference between giants, Jotuns and trolls in Norse mythology?

It has three votes as too broad. Here's the review task: https://mythology.stackexchange.com/review/close/254

I don't agree. I don't know the answer, but it likely could be answered quite succinctly, with an answer in the form of:

• A Giant is blah blah
• Jotun is blah blah
• A troll is blah blah

Citation 1, 2, 3

It's a good question. Please leave it open.