Interpreter

Software that executes source code (e.g., Python, JavaScript) instruction-by-instruction at runtime, enabling immediate execution and simplifying the debugging cycle.

The Interpreter is a critical software component: it executes high-level source code, translating instructions into machine-readable format at runtime. This differs from a compiler, which processes the entire code base before execution. Interpreters are essential for dynamic languages like Python, Ruby, and JavaScript, facilitating rapid development by providing immediate, line-by-line error feedback. For performance optimization, many modern interpreters first translate source code into an intermediate bytecode (e.g., Java's JVM uses this method), which is then executed. This execution model is key to achieving cross-platform compatibility: the same source code runs on any system hosting the compatible interpreter.

https://en.wikipedia.org/wiki/Interpreter_(computing)