The Job job entry executes a previously defined job, which allows you to perform functional decomposition: a break out of jobs into more manageable units.
For example, instead of writing a data warehouse load using one job which contains 500 entries, you could create smaller jobs and aggregate them.
CAUTION:
Although it is possible to create a recursive, never-ending job that
points to itself, you should be aware that such a job will eventually fail with an out of
memory or stack error.