Just-in-Time (JIT) production is a manufacturing philosophy aimed at minimizing waste and improving efficiency by producing goods only when they are needed and in the exact quantities required. Originating from Japan, specifically at Toyota in the 1970s under the guidance of Taiichi Ohno, JIT has evolved into a global production strategy. Its goal is to reduce inventory costs, eliminate overproduction, and align production processes with actual customer demand. This article delves into the principles, benefits, challenges, and modern applications of JIT production.