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SpiderMonkey is Mozilla's JavaScript engine, first introduced in 1995 by Brendan Eich for the Netscape Navigator web browser. It was the first-ever implementation of JavaScript and has since evolved into a sophisticated engine used in various applications, including Mozilla Firefox.

Key Features of SpiderMonkey:
ECMAScript Compliance:
SpiderMonkey adheres to the ECMAScript standard, ensuring it supports modern JavaScript features like ES6 modules, async/await, and more.

Just-In-Time (JIT) Compilation:
To enhance performance, SpiderMonkey employs multiple JIT compilers (Baseline and IonMonkey) to optimize JavaScript code execution dynamically.

Garbage Collection:
SpiderMonkey uses a garbage collector to manage memory efficiently, ensuring that unused objects are cleaned up to prevent memory leaks.

WebAssembly Support:
It supports WebAssembly (Wasm), enabling the execution of compiled languages like C++ and Rust in the browser.