Explained: What is the Places of Worship Act?

After #GyanvapiMasjid was sealed due to the declaration of a '#Shivling' being discovered inside, contesting stories have been moving around the disputed Places of #WorshipAct 1991 as the mosque management committee contests the lawsuit in court by invoking this Act.
But what is the Places of worship act, of 1991? and why one community overlook this act and another community use it as a shield to justify their claims.
#GyanvapiMosque #GyanvapiMosquesurvey #AyodhyaRamJanmbhoomi