Define void pointer in C?
Till now, we have studied that the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid assigned to a pointer should be of the same type as specified in the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid declaration. For example, if we declare the int  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid, then this int  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid cannot point to the float  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid or some other  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid of variable, i.e., it can point to only int type variable. To overcome this problem, we use a pointer to void. A pointer to void means a generic pointer that can point to any  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid type. We can assign the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid of any data type to the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid pointer, and a void pointer can be assigned to any type of the pointer without performing any explicit  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid.

Why we use void pointers?
We use  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid pointers because of its reusability. Void  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid can store the object of any type, and we can  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid the object of any type by using the indirection  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid with proper  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid.

Why we use dereferencing pointer?
 addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid a pointer is used because of the following reasons:
It can be used to access or manipulate the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid stored at the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid location, which is pointed by the pointer.
Any  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid applied to the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid pointer will directly affect the value of the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid that it points to.

What do you mean by Command Line Arguments in C?
The  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid passed from command line are called command  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid arguments. These arguments are handled by  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid() function.
To support  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid line argument, you need to change the  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid of main() function as given below.
int main(int argc, char *argv[] )
Here,  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid counts the number of arguments. It counts the file name as the first argument.
The argv[] contains the total number of arguments. The first  addressargcargumentargumentscommanddataDereferencedereferencedlinemainmemoryoperationoperatorpointerpointersretrievestructuretypetypecastingvariablevoid is the file name always