What are the different types of ‘ idda (waiting period)
and what are their extents?

According to the Islamic shari’a, the ‘idda is a waiting period with
certain exigencies required of a woman when the appropriate
condition exists—either divorce or death (of her husband). As for
divorce, the ‘idda for a pregnant woman is until she delivers her
child, and for one who still menstruates, it is three menstrual cycles,
whereas for one who is either too young or too old to menstruate, it
is three months.

As for the widow whose husband has passed away, if she is
pregnant then her ‘idda is until she delivers her child; otherwise, it is
four months and ten days.