// It is a field Which may be unique in each instance of a category personal int _field; // This can be a property that accesses a discipline, but since it's visibility // is shielded only subclasses will know concerning this property // (and thru it the field) - https://propertyingurugram.in/with-covid-19-transforming-the-way-we-live-virus-safe-apartments-become-the-buzzword/