what is Hoisting in javascript

Hoisting is not about physically moving code to the top , but rather about how javascript allocates memory for variables and functions during memory creation phase

• you can call function before its declaration in the code because entire function is available in code from start.

• But function expression can't be hoisted

• but trying to access variable before its declaration will result in "undefined"

what javascript sees?

Q) why it gives us a impression that declarations are move to top of their scope but its actually not ?

• because only declaration is processed before any code is executed not a initialization.