[Question] Memory Hacking Questions

[Aqollo]

I've came back to learn how to hack in Combat Arm's and I'm wondering on how a few things. Also, I'd appreciate if you did not say google, as I've looked around before I've asked these.

1. What is "NOPPING" exactly and what is it used for(like in terms of combat arms). I've seen method's using memcopy and virtual protect using these.
2. What are "Detors" and what can they be used for if they can in combat arms?
3. I have this nopping method here, I BELIEVE it is just a function type definition. I did not make this method, but forgot who'm made it.

bool Memoria( void * pDest, char * szPatch, size_t sSize ) //Nopping Method
{
    DWORD dwOrgProtect = NULL;
    if ( !VirtualProtect ( pDest, sSize, PAGE_EXECUTE_READWRITE, &dwOrgProtect ))
        return FALSE;

    memcpy( pDest, szPatch, sSize );
    VirtualProtect( pDest, sSize, dwOrgProtect, NULL );
    return TRUE;
}

I'm wondering what it accautly does. Noting big a simple definition will do.

4. What are enemy and player pointers for. Do they just point ot the character at all times and remain static or something? Or how do they work.

This will help me alot if someone can answer these questions.