It's a wrong world. the right one is “嗯". But 恩 is more convenient,so we always use this to refer to it. It's has many means. Sometime it means that you agree with what others say,just like "ok". And it was also used when you are not sure about sth. ”嗯……“ Actually, it depends on what others ask ?

恩，一般是回答用语。是一种语气词，表示认同，肯定。在回答别人问题是表示认同。 有时候仅仅是一种语气词。

恩=＂嗯＂意思就是 “知道” 了

I think if there is only this world,it's a wrong world.The right one is "嗯"。“嗯”means yes,means 'I agree with you' or 'I've heard you' or 'I know'

其实用“恩”这个字是错误的，应该用“嗯”。有可能“嗯”这个字不太容易打出来，所以就用了“恩”。“嗯”的意思有很多，有“是的”、“好”等等，或者当别人叫你的时候也可以这样回答。