JavaScript hoisting involves moving variable and function declarations to the top of their scope.When using var, the variable is hoisted and initialized as undefined.Variables declared with let and const are also hoisted but kept in the Temporal Dead Zone (TDZ).TDZ is the time between when the scope starts and when the variable is declared, where you can't access the variable.Function declarations are fully hoisted, allowing them to be called before declaration.Function expressions like arrow functions follow TDZ rules and can cause errors if accessed before declaration.Best practices include declaring variables at the top, using let and const over var, and structuring code to read top-down.Using linters like ESLint can help catch TDZ bugs, and thinking of hoisting as JavaScript's pre-processing stage can aid in understanding behavior.Understanding hoisting and TDZ can prevent unexpected errors and improve code quality in JavaScript.Remembering the rules of hoisting and TDZ can make your code more predictable and easier to debug.