difference between Scope and Lifetime?

Scope: It defines the visibility/accessibility of the variable in a program. For example take a local variable where the scope is local to that function.For static global variable,scope is limited to that file only. For global variable the scope is across multiple files (if it is with extern specifier)

Lifetime: It is the duration of time for which the variable holds the value during the execution of a program. For local variable the lifetime is within the functional block in which it is declared. The memory allocated when function starts and deallocated when it terminates. So,the lifetime of the variable defined in that block is local the functional block.

On the other side, for static variable, the life time will be the entire execution of the program. When the variable is used it takes the last stored value in that memory location. The value persists even between function calls. The life time is entire execution of the program.