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The question is ambiguous, since there are many types of operators.
Telephone service - The original purpose of a telephone operator was to connect calls. Now, that is mostly automated and operators are only there if there are problems or assistance is needed.
Computer logic - Boolean functions (or operators) such as AND, OR, NOR, XOR, NOT, NAND, etc. are used to toggle individual bits, perform calculations, etc.
Computer user - Most computers need someone to operate them.
Operators and Operator Functions : An operator functionimplements a particular operator symbol. The database server provides special SQL-invoked functions, called operator functions, that implement operators. An operator function processes one to three arguments and returns a value. When an SQL statement contains an operator, the database server automatically invokes the associated operator function. The association between an operator and an operator function is called operator binding. You can overload an operator function to provide the operator for a UDT. The SQL user can then use the operator with the UDT as well as with the built-in data types. When an SQL statement contains an operator, the database server automatically invokes the associated operator function.