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# Difference between argument and parameters

Am I correct in saying that parameters are what you define in the parenthesis when you make a new function? And an argument is what you put into the function parenthesis when you call that function later? Not sure if this right and couldn't get to the bottom of it from the video. Hope there is a simple explanation. Thanks!

Dear Benjamin, parameter is a kind of placeholder. It keeps values in side it. And the value is nothing but its arguments. Such as if you declare a function, sayHello(x,y), here x and y are two parameters and when you call this function with some value like sayHello(4,5) then 4 and 5 are arguments.

Hi Benjamin,

You are right.

Let's see an example:

//in function Sum, a & b are the function parameters

```function Sum(a, b) {
return a + b;
}
```

In the below expression, when you're calling the above function, values 2 & 3 that you pass are the Sum function's arguments.

```var x = Sum(2, 3);
```

Hope that makes it clear for you. All the best :)

I've been programming for years, and i didn't know the how to call them apart. I used 'parameters' and 'arguments' interchangeably. Thanks, now it's clear.

The parameter is a placeholder yes! When the function is called, the parameter BECOMES an argument.