Thread: Insert when, Insert all when difference

Insert when syntax is
INSERT
WHEN condition THEN
INTO table_name column_list
VALUES (values_list)
WHEN condition THEN
INTO table_name (column_list)
VALUES (values_list)
ELSE
INTO table_name (column_list)
VALUES (values_list)
SELECT column_list FROM table_name;

Insert all when syntax is
INSERT ALL
WHEN (condition) THEN
INTO table_name (column_list)
VALUES (values_list)
WHEN (condition) THEN
INTO table_name (column_list)
VALUES (values_list)
ELSE
INTO table_name (column_list)
VALUES (values_list)
SELECT column_list FROM ;

What is the difference in their functionality?