Difference between Union and Minus in Oracle

Let's consider the difference between Minus and Union using
following examples.

1.create TABLE A AND B With similar structure
2.insert records in Table A and B.
3.Keep some records identical(here 2 rows).
4.find out the difference betwn 2 looking into the output.


CREATE TABLE A(NAME VARCHAR2(30));
  INSERT INTO A VALUES('A');
   INSERT INTO A VALUES('B');
   INSERT INTO A VALUES('C');
   INSERT INTO A VALUES('D');
COMMIT;
   
CREATE TABLE B(NAME VARCHAR2(30));
INSERT INTO b VALUES('A')
INSERT INTO b VALUES('B')
INSERT INTO b VALUES('Y')
INSERT INTO b VALUES('X')
COMMIT;



1) SELECT * FROM A
 MINUS
 SELECT * FROM B

NAME                         
------------------------------
C                            
D                            
2 rows selected



 2)SELECT * FROM A
 UNION
 SELECT * FROM B


NAME                         
------------------------------
A                            
B                            
C                            
D                            
Y                            
x                            
6 rows selected