Function scope in JavaScript refers to the scope of variables and functions that are defined within a function. Variables and functions declared with the var keyword have function scope.

Variables declared inside a function are accessible only within that function and any nested functions. They are not accessible outside of the function in which they are defined. This means that variables declared within a function cannot be accessed before their declaration or outside of the function.

Example: Here, the variable x is declared inside the exampleFunction() function. It is accessible within that function and also within the innerFunction() nested inside it. However, x is not accessible outside of exampleFunction().

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