Hi, i have a c programming doubt?

I want to know the difference between the two and where one is useful over other?

suppose i have a struct called employee as below:

struct emp{
   char first_name[10];
   char last_name[10];
   char key[10];
};

Now, i want to store the table of employee records, then which method should i use:

1. struct emp e1[100]; // Or
2. struct emp * e1[100];

I know the two are not same but would like to know a use case where second declaration would be of interest and more advantageous to use?

Can someone clarify?