Closure:
A closure is the local variables for a function - kept alive after the function has returned, or
A closure is a stack-frame which is not deallocated when the function returns. (as if a 'stack-frame' were malloc'ed instead of being on the stack!)
Hoisting:
In Javascript, we have multiple var-statements in a function. All of these statements act as if they were declared at the top of the function. Hoisting is the act of moving the declarations to the top of the function.
