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Syntax: define() to define ⁣modules and asynchronous loading.
Use ⁣Cases: widely used in browser-based applications, especially before ES modules became prevalent.
Example:

javascript
    // moduleA.js
    define(function() {
      return function() {
        console.log("Hello from Module A!");
      };
    });

    // moduleB.js
    define(['./moduleA'], function(moduleA) {
      moduleA();
    });
    

3. Global Module Definition (UMD)

UMD aims to be compatible with both CommonJS and AMD, providing a single module​ format ⁤that ⁣works ‍in various environments. It attempts to detect the ⁢module system and ‍adapt accordingly.

Syntax: A wrapper function that checks⁣ for‍ different⁢ module environments. Use Cases: Useful for creating libraries that need to work in both Node.js and the browser.
Complexity: Can‌ be more complex to write than CJS or AMD ⁤directly.

Syntax: import to import ​modules and export to export. Use Cases: ​ Increasingly becoming the standard‌ for modern JavaScript growth, supported natively⁢ in most browsers⁢ and Node.js.
Example:
```javascript
​ //‌ moduleA.js
​ export function sayHello() {
console.log("Hello from Module A!");
}

// moduleB.js
⁣ import { sayHello } from ⁢'./moduleA.js