What is batch processing?

Batch processing is when a series of jobs are exectued without any human interfering. This means that in batch processing, all necessary information is collected first and given to the processor as the inputs, and then the computer processes this information without any user involved until the results are produced.
This can be very useful when trying to optimise our use of the computers, because there are tasks that take a long time and don't need human intervention, such as getting the computer to produce the monthly payrolls for a company, and these tasks can be done in batch by the computers overnight, when nobody needs the computing resources, leaving the resources available during the day for the workers.