What is the temporal dead zone?

Question

I\'ve heard that accessing let and const values before they are initialized can cause a ReferenceError because of something called the

Answer 1

Hoisting:
let,const,var are all get hoisted process.
(whats mean they go upper and declare in the top of the scope.)

Initialisation:

• var go also through the initial process, and get initial value of undefined.
  
• while let,const didn't go throw the initial process, so their values are still inaccessible, although they already declared. whats put them in temporal dead zone

So in shortly:

hoisting process: var, let, const
Initialisation process: var