What is scope in JavaScript?

In JavaScript, “scope” refers to the visibility and accessibility of variables, functions, and objects within a specific portion of the code. There are two types of scope in JavaScript: global scope and local scope.

Global scope refers to the context in which all variables, functions, and objects are declared globally and can be accessed from anywhere in the code. In other words, if a variable is declared outside of any function, it is said to have global scope.

Local scope refers to the context in which variables, functions, and objects are declared within a function and can only be accessed from within that function. In other words, if a variable is declared within a function, it is said to have local scope.

It’s important to understand scope in JavaScript because it affects the behavior and output of your code. If you try to access a variable or function that is out of scope, you will get a “ReferenceError” indicating that the variable or function is not defined.