It sort the result-set by a specified column and by default it sort in ascending order

SQL ORDER BY Syntax

SELECT column_name(s) FROM table_name ORDER BY column_name(s) ASC|DES ;

MySQL Table – users

+—-+——+
| id | name |
+—-+——+
|  1 | PHP  |
|  2 | JS   |
|  3 | HTML |
|  4 | PHP  |
+—-+——+

Example

mysql> select * from users ORDER BY name ;
+—-+——+
| id | name |
+—-+——+
|  3 | HTML |
|  2 | JS   |
|  1 | PHP  |
|  4 | PHP  |
+—-+——+
4 rows in set (0.02 sec)

mysql> select * from users ORDER BY name DESC;
+—-+——+
| id | name |
+—-+——+
|  1 | PHP  |
|  4 | PHP  |
|  2 | JS   |
|  3 | HTML |
+—-+——+
4 rows in set (0.00 sec)