A Function Expression is a way to define a function using an expression. You define a function within an expression, typically by using the function keyword to make an anonymous function, which is then stored in a variable. It can also be assigned to a property on an object, passed as an argument to another function, or returned as a value from a function.
When defining a function expression, you can also give it parameters, just like a regular function. You can then invoke the function expression by calling the variable name and passing in any arguments required by the function.
One of the advantages of using Function Expressions is that they allow you to define a function and use it at the same time. This can be helpful when you need to create a function that is only used once in your code.
By understanding Function Expressions, you can create more flexible and modular code, making your code more readable, maintainable, and scalable.