Understanding 'purdah' requires respect for cultural practices different from one's own. I read about 'purdah' to appreciate its cultural importance in some societies.
Pro Tip 2/3
Not Universal
'Purdah' is not practiced by all Muslims or Hindus, it varies with regions and communities. Though 'purdah' is common in certain places, my Muslim friends don't observe it.
Pro Tip 3/3
Gender Specific
The term is usually associated with women, highlighting gender roles in certain societies. The documentary explained how 'purdah' affects women's participation in public life.