Continuous improvement, also called "Kaizen," means always trying to make things better. It involves making small, gradual changes to processes, systems, and activities in order to keep improving them over time. The aim of getting better constantly is to get rid of unnecessary things and make things go smoother, be better, and make customers happier.
Unfortunately, many people wrongly believe that plan-do-check-act (PDCA) is a cycle for improving things without considering the involvement of people. PDCA strives to make process better, but if you only make the process better without developing and teaching your people, you risk the process regressing. People need to learn and understand how to continuously improve things so they can continue to manage the process using the new method.