What is the batch job and online job?

Question:
What is the batch job and online job?
Answer:
A batch job is a stand alone job (no human interaction) that is kicked off by a utility job(usaually at night)  and runs data in bulk streams, such as updating 1 million rows to a database nightly, online job is real time, such as a user updating their address via  an interface screen and it being applied to the database as soon as they have confirmed it.
Answer 2:
In batch input and output is file where as in online input and output is user interactive.
In batch start of job is done by JCL where as in online it is done by transaction.
Execution time is longer in batch where as less in case of online.