1. Boxing
If at all a value type is assigned to a refernce type variable we call it as "Boxing"
Eg-
int i=99; //varialbe initialization
Object obj=i; //Assign variable to obj(i.e Boxing)
2. Unboxing
Converting reference type back into value type is known as "Unboxing"
Eg-
int j=(int)obj; //(unboxing)