First, refer to different
1, Hello: Hello.
2. Hello: Hello everyone.
Second, the usage is different.
1, Hello:hello as an exclamation is mainly used to greet acquaintances-"hello", which can often be transliterated as "hello", can also be used to address distant acquaintances or strangers to attract attention, and can also be used as a language to address each other on the phone.
2.hello there: In British English, hello can also be used to express a cry of surprise, meaning "yo". Hello is usually placed at the beginning of a sentence.
Third, the emphasis is different.
1, hello: used to say hello, answer the phone or attract attention.
2. Hello over there: Say hello to a friend who is a little farther away.