Hi和Hello的区别如下：
1、汉语解释方面
hello的意思是你好，hi的意思只是打招呼。比如，电话里我们接到不熟悉人电话，我们不会说hi，那是打招呼，一般我们用hello，你好。
2、使用范围
hi一般用于熟悉人，hello一般用于所有人。
3、词义方面
Hello 是比较礼貌的，可以对任何人和任何情况下用 hello mum ， hello Dr Zhang 。而 Hi 比较随意非正式场合用。
扩展资料：
"Hello" ，"Hi"，"Hey" 等级划分
"Hello" is the most formal of these greetings. In most cases, it is used when meeting someone for the first time, when greeting the boss (depending on how close the relationship is), and of course, it is used with friends and family as well. Also, most people use "hello" when they answer the phone.
"Hi" is more formal than "hey" but less formal than "hello". It is used when meeting someone for the first time casually but usually not in formal situations like a business meeting or job interview.
"Hey" is the most casual. It is used between friends and family. It can also be used when meeting someone for the first time, like a blind date or meeting new people at a party, or similar situation.
参考资料：百度百科 -hello（词语释义）
参考资料：百度百科-hi（英文单词）