What is the term batch processing?

Batch processing allows you to do multiple operations in one step.

For example, if I need to resize 400 pictures to 800x600, I'd much rather batch process them than go through and edit each one in Photoshop or Gimp.

When Microsoft Windows used to run based on DOS, batch processing often referred to the DOS Batch files (.bat) that issued lists of commands in DOS without you having to type them all in.