A process defines a template for automating repetitive work, like a recipe that describes the actions that you perform to achieve a goal. For example, consider a Hire employee process. Each time an organization hires someone, the recruitment team has to complete a number of tasks, including Evaluate CV, Plan interview and Interview candidate. Each time someone starts the process, Workflow Accelerator creates a new case.
Use the process builder to create and configure executable processes. You can think of an executable process as a kind of software, but you will find it easier to build automation using processes. With Workflow Accelerator, non-technical people can create useful processes.