Explanation isEqual: and == comparison for the Objective-C mutable and immutable objects

gistfile1.m

//  Set non ARC flag (-fno-objc-arc) for the execution file    
//  http://stackoverflow.com/questions/6646052/how-can-i-disable-arc-for-a-single-file-in-a-project
//
//
    NSMutableArray *mutableArrayOrginal = [NSMutableArray arrayWithObjects:@"asdasd", nil];
    NSLog(@"mutableArrayOrginal address is: %p", mutableArrayOrginal);
    NSMutableArray *mutableArrayCopy = [mutableArrayOrginal copy];
    NSLog(@"mutableArrayCopy address is: %p", mutableArrayCopy);
    
    if ([mutableArrayOrginal isEqual:mutableArrayCopy]) {
        NSLog(@"Mutable Arrays Equal (isEqual:)");
    } else {
        NSLog(@"Mutable Arrays NOT Equal (isEqual:)");
    }
    
    if (mutableArrayOrginal == mutableArrayCopy) {
        NSLog(@"Mutable Arrays Equal (==)");
    } else {
        NSLog(@"Mutable Arrays NOT Equal (==)");
    }
    
    
    NSArray *immutableOrginal = [NSArray arrayWithObjects:@"asdasd", nil];
    NSLog(@"immutableOrginal address is: %p", immutableOrginal);
    NSLog(@"immutableOrginal retain count, before copy is: %i", [immutableOrginal retainCount]);
    NSArray *immutableCopy = [immutableOrginal copy];
    NSLog(@"immutableOrginal retain count, after copy is: %i", [immutableOrginal retainCount]);
    NSLog(@"immutableCopy address is: %p", immutableCopy);
    
    if ([immutableOrginal isEqual:immutableCopy]) {
        NSLog(@"Immutable Arrays Equal (isEqual:)");
    } else {
        NSLog(@"Immutable Arrays NOT Equal (isEqual:)");
    }
    
    if (immutableOrginal == immutableCopy) {
        NSLog(@"Immutable Arrays Equal (==)");
    } else {
        NSLog(@"Immutable Arrays NOT Equal (==)");
    }