how CONNECT BY work in ORACLE?

See more:

Oracle

I'm not able to understand how CONNECT BY is working below:

SELECT employee_id, last_name, manager_id
   FROM employees
   CONNECT BY PRIOR employee_id = manager_id;

EMPLOYEE_ID LAST_NAME MANAGER_ID
----------- ------------------------- ----------
101 Kochhar 100
108 Greenberg 101
109 Faviet 108
110 Chen 108
111 Sciarra 108
112 Urman 108
113 Popp 108
200 Whalen 101

As per my understanding The CONNECT BY clause specifies the relationship between parent rows and child rows of the hierarchy.

CONNECT BY <child_value> = <parent_value>

PRIOR operator to refer to the parent row. Could you please let me know how this is working? how we get this output? Thank you.