A common English greeting. Not an insult or a compliment. Hello is used when first seeing somebody, then a conversation
will begin. A synonym for hello is
hi.
Hi is used more commonly when texting but also is used in face to face conversation.
Stacy: Hello Rebecca!
Rebecca: back off! I have a restraining order and I
will call my lawyer of you
don't leave!
Another way hello is used
Stacy: hello Harold
Harold: hello Stacy
Stacy: how has your
day been?
Harold: fine. How about you?
Stacy: not bad.
Etc....