Kaizen is a Japanese philosophy of continuous incremental improvement involving small, ongoing changes made by employees at every level of an organization. It was developed by Masaaki Imai and means "change for the better" or "continuous improvement." The main principles of Kaizen are to consider the entire process, avoid blaming individuals, and implement the best process. It is highly effective, team-based, and focuses on reducing waste and improving quality, efficiency, and employee satisfaction through small, ongoing changes.