Function Declaration vs Function Expression: What’s the Difference?

Functions are reusable blocks of code that perform specific tasks, accepting inputs and producing outputs. Function declarations use the `function` keyword, a name, and optional parameters, defining the function's body for execution. Function expressions, on the other hand, assign a function to a variable, often anonymously. A key difference is hoisting; declarations are hoisted, allowing calls before their definition, while expressions are not fully hoisted. Hoisting, at a high level, moves declarations to the top of their scope during compilation. Function declarations are suitable for standalone functions needed throughout the code, offering readability and hoisting benefits. Function expressions are best for callbacks, immediate function invocation, and conditional definitions, providing structured control and avoiding global scope pollution. The choice between them depends on hoisting needs, function usage, code style, and desired scope.