A Lua script is a set of instructions written in the Lua programming language, known for its simplicity and efficiency. Lua is a lightweight, high-level scripting language commonly embedded in software applications to automate tasks, customize behavior, or extend functionality. It is widely used in areas such as game development, network servers, and cybersecurity tools, including popular platforms like Redis. Lua scripts are valued for their speed, ease of integration, and minimal resource requirements, making them ideal for applications where performance and flexibility are important.