— Lua on Wikipedia
Lua (meaning moon) is a lightweight, multi-paradigm programming language designed primarily for embedded systems and clients. Lua is cross-platform, since the interpreter is written in ANSI C, and has a relatively simple C API.
Lua was originally designed in 1993 as a language for extending software applications to meet the increasing demand for customization at the time. It provided the basic facilities of most procedural programming languages, but more complicated or domain-specific features were not included; rather, it included mechanisms for extending the language, allowing programmers to implement such features. As Lua was intended to be a general embeddable extension language, the designers of Lua focused on improving its speed, portability, extensibility, and ease-of-use in development.