Static variable is the one allocated statically, meaning 
that, it is allocated once in the program space and exists 
till the program space is deallocated (the close of the 
application).

Note:- Some people get confused between stack allocation 
and static allocaion. Both are different terms.

A static function is again the same concept with static 
variable allocation, but here the allocation is not just a 
variable but a function's 'activation frame'. The 
activation frame, for now, consider the function's 
information required by the compiler to execute the 
function which is stored internally.