Key Differences: Hoisting: Function Declaration: Fully hoisted. You can call the function before its declaration in the code. Function Expression: Only the variable is hoisted, not the function definition. You must define the function before you can call it. Naming: Function Declaration: Must have a name. Function Expression: Can be anonymous or named. Use Cases: Function Declarations: Typically used for general-purpose functions that are available throughout the entire scope. Function Expressions: Often used for callbacks, event handlers, or when defining functions dynamically.