Process Improvement is a technique from Business Process Management (BPM). BPM is a management practice to think about what the organisation does in terms of processes.
Any activity that your company does is a business process. If this is what you do in order to meet your customer’s requirements, then it makes sense to view them as assets of the business that need to be managed.
Process Improvement examines processes in order to drive consistent outputs, increase agility and improve operations