The term "JIT" can refer to two main concepts depending on the context:
1. Just-In-Time Compilation (Computing)
JIT compilation is a technique in computing where code is compiled during the execution of a program (at runtime), rather than before execution. It typically involves translating intermediate code (like bytecode) into machine code on the fly. This approach combines the speed of compiled code with the flexibility of interpretation. The JIT compiler analyzes code as it runs, identifies frequently executed parts ("hot spots"), and compiles those into optimized machine code to improve performance. This method is widely used in environments like Java Virtual Machines and modern web browsers for JavaScript execution. JIT can optimize code specifically for the CPU and operating system it runs on, often resulting in better performance than static ahead-of-time compilation
2. Just-In-Time Inventory/Manufacturing (Business/Production)
JIT in inventory management and manufacturing is a strategy where materials and goods are received only as they are needed in the production process, minimizing inventory holding costs and reducing waste. This approach requires accurate demand forecasting and a reliable supply chain. It was popularized by Toyota in the 1970s as part of the Toyota Production System and focuses on producing exactly what is needed, when it is needed, to improve efficiency and reduce excess inventory. JIT manufacturing aims to eliminate waste in time, materials, and resources while ensuring steady production and quality
. In summary, JIT can mean either:
- Just-In-Time Compilation in software, a runtime code optimization technique, or
- Just-In-Time Inventory/Manufacturing , a lean production and inventory management philosophy.
The context usually makes clear which meaning applies.
