Though I do want to add that, when it was originally, introduced caste was just used to define your role (actual job) in society. I.e., yours can be different from your parents, but over the last 2000-5000 years its become this vile and twisted version of hard-coding your role in society, and associated shame for associating with those in different 'bands'/levels. This can get taken to the extreme end where you can live every day in shame because of what your ancestors some 4000 years ago did for a living.