Final answer:
Purdah is the practice of wearing a veil by women. Guru Amardas Ji opposed this practice.
Step-by-step explanation:
Purdah refers to the wearing of a veil by women. It is a practice that restricts the visibility of women to men outside of their immediate family. Guru Amardas Ji, a prominent Sikh Guru, opposed the practice of Purdah as it conflicted with the Sikh principles of equality and liberation.