What are different types of Scope Chain available in JavaScript?

If we check in the program, every local scope has a connection with one or more scope in their back which forms a chain. This chain goes on until it met with the global scope which is the root of this hierarchy. As global scope doesn't have a parent, so it is on the top of the chain. This is known as scope chain.

The scope chain in JavaScript is basically used to resolve the values of the variable. Without this, it is difficult for a JavaScript to choose a certain value for a variable if there are many variables defined at different scopes.