WHAT IS ADAPTER IN ANDRID code example

Example: adapters in android

public class MyAdapter extends ArrayAdapter {

public MyAdapter(Context context, int resource, int textViewResourceId, List objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public int getCount() {
return super.getCount();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
return super.getView(position, convertView, parent);
}
}