To Work with this attribute It is necessary to inherit a class from special base class-initializer or use a static helper process: The query is "what is the main difference...", but by far the most voted answers react with "in place of telling you what exactly is the primary difference https://medium.com/@AiplJoyDistrict/modern-serenity-awaits-at-aipl-sector-103-gurgaon-af77f40554b7?postPublishedType=initial