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So far, I've only described one type of workflow: the one that runs through a series of actions once, and then stops. Sometimes, you need a workflow that repeats a series of tasks over and over. For example, you might want to process a series of files in one folder, then move on to another folder, and so on. Or you might want to save data to a series of log files.
Although you could create scheduled workflows to do the same thing, sometimes a loop simplifies the process for you — not only keeping your workflows more concise but also more manageable. Loops also give you some other benefits: They allow you to specify how many times (or for how many minutes) a loop should run.