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In C what is meant by variable declaration and variable definition?

int a; -----> declaration
a = 10; -------> definition

Is this correct? Or it is other way around?

Then what is "int a =...

Thanks

void new_friend(){
char *name;
char *phone;
char *email;

printf("\n------New friend info------\n");
printf("Name: ");
scanf("%s", name);
printf("Phone-No: ");
scanf("%s", phone);