JavaScript Variables Explained: Differences Between let, const, and var

JavaScript offers three ways to declare variables: var, let, and const, each with distinct behaviors. The const keyword prevents reassignment of values, while let and var function similarly but with key differences in scope and redeclaration rules. Unlike let and const, var allows the same variable to be declared multiple times within the same scope. One notable drawback of var is hoisting, where variable declarations are automatically moved to the top of their scope and initialized as undefined before the code runs. Understanding these differences is essential for writing predictable and bug-free JavaScript code.