Typedef in structure declaration

typedef struct book
{
    int id;
    float price;
    char name[15];
}book;
book b1;

                                                                   OR

typedef struct
{
    int id;
    float price;
    char name[15];
}book;
book b1;

By using typedef keyword in our structure declaration we have eliminated the need to use struct keyword to declare a structure variable.

Without typedef we declared structure variable as 

 struct book b1;

With typedef we just declare structure variable as

book b1;