What is absentmindedness during prayer, and what is the legal ruling concerning it?

If the question is about the reasons for the prostration of forgetfulness (sujud al-sahw) in prayer, this has been explained previously in Fatwa No. 32327. If the question is about the ruling on the prostration of forgetfulness, refer to Fatwa No. 45643. If the question is about forgetfulness, and the lack of devotion (khushu') and contemplation of the Quran in prayer, refer to Fatawa Nos. 32124 and 40009. For the reasons for devotion (khushu') in prayer, see Fatwa No. 34584.