Different between define and const in c

Question

What different between define and const in c programming
Where is usage of its

Answer 1

you can't change the value of define but you can change that of const with a pointer

Answer 2

The #define preprocessor statement will replace all things by another...
Exemple :
#define A 10
int b = A; //before compilation this line is equal to int b = 10;

Answer 3

Tanx sir

Answer 4

Can we change the value it?