c - Using pointers and structs -

hello i'm not sure if i'm understand following piece of code. glad if read explanations , correct me if i'm wrong.
first of i'm declaring struct 3 arrays of char , integer.

struct employee  {     char last[16];     char first[11];     char title[16];     int salary;  }; 

after declare function takes 3 pointers char , integer value. function uses malloc() , sizeof() create struct on heap. creations of object on heap not clear me. when use struct employee* p = malloc(sizeof(struct employee)), happens there exactly?
happens when use function struct employee* createemployee (char* last, char* first, char* title, int salary) several times different input. know pointer p isn't same pointer same struct on heap. rewrite information on heap, when use function several times? or create new object in different memory space?

struct employee* createemployee(char*, char*, char*, int);  struct employee* createemployee(char* last, char* first, char* title, int salary)   {     struct employee* p = malloc(sizeof(struct employee));     if (p != null)      {         strcpy(p->last, last);         strcpy(p->first, first);         strcpy(p->title, title);         p->salary = salary;     }     return p;  } 

i glad if explain me. thank much.

the malloc function allocates new bytes on heap , returns pointer.

so createemployee function allocates new memory every time it's called, fills data (in unsafe way - consider using strncpy instead) , returns pointer memory. return different pointer every time it's called.

each instance create function exist long don't call free on pointer.