Why is null<>null=null in mysql

Question

I am going through a tutorial for MySql, and I came through the following query.

mysql> select null <> null;
+--------------+
| null <> null |
+--         


        

Answer 1

select null <> null;

Here <> is not null safe operator. It is Not equal operator. Refer official website of mysql.
Null safe operator is <=>