Kaizen is a Japanese philosophy of continuous improvement involving small, incremental changes on a regular basis. The philosophy is based on identifying problems, solving them at their source, and changing standards to prevent recurrence. Using kaizen, employees are encouraged to submit improvement suggestions, with over 90% typically being implemented. This leads to benefits like improved productivity, quality, safety, and customer satisfaction through the elimination of waste. Key principles of kaizen include a focus on customers, continuous improvement, self-discipline, acknowledging problems openly, and involving cross-functional teams.