Difference between var functionName = function() {} and function functionName() {} in JavaScript

Hello, colleagues! I'm a beginner frontend developer and I've run into some confusion. In different projects and tutorials, I see two ways of declaring functions: ```javascript // Method 1: Function Expression var myFunc = function() { console.log("Hello from expression!"); }; // Method 2: Function Declaration function myFunc() { console.log("Hello from declaration!"); } ``` At first glance, they do the same thing. But when I started writing more complex code, I noticed strange behavior. For example, if I call a function before its declaration, one method works while the other throws an error: ```javascript // This works sayHello(); // Outputs "Hello!" function sayHello() { console.log("Hello!"); } // But this throws an error s