need to - something necessary for survival or your immediate well-being, for example. have to - something you are obliged to do due to certain responsibilities or a contractual duty, for example. want to - something you desire and will choose to do. Hope that helps! I can help you with English in a class, please check out my teacher profile :)

"need to" and "have to" are similar in terms of necessity and/or obligation. "want to" is more about having a choice but not exactly having the primary need.

In my experience I think there is a a difference between severity: Want to --> Have to. --> Need to This may be subjective.

"want to"는 "하고 싶다"와 비슷하다고 생각하시면 되고요. 어떤 일을 의도적으로 하려고 할 마음을 갖는 것이에요. "need to"는 "해야 된다"와 비슷하다고 생각하시면 돼요. 어떤 일을 할 필요가 있다는 뜻이에요. 그리고 "have to"는 약간 "need to"와 비슷한 의미일 수도 있거나 좀 더 강조하는 의미일 수도 있어요. 아마 "꼭 해야 된다"와 비슷하지 않을까 싶어요. 원어민들이 "need to"와 "have to"는 그렇게 엄격하게 구분하지 않아요~

I need to eat to live. I have to get food to satisfy that need. I want to eat tasty food. I think examples(really images) are better than definitions.