What is meant by "al-Shafʿ" and "al-Witr"? May Allah reward you with goodness.

Scholars have differed regarding the meaning of "al-Shafʿ" (the even) and "al-Witr" (the odd) by which Allah Almighty swore in the Quran. The most affirmed opinions state that "al-Witr" refers to the Day of Arafat and "al-Shafʿ" refers to the Day of Sacrifice (Yawm al-Nahr).

As for "al-Witr" in jurisprudential terminology, it is the prayer that concludes the night prayer. It is prayed individually (one rak'ah, or three, and so on). The last rak'ah of the night prayer is called "Witr" if it is not separated from what preceded it by a salam (salutation). If it is separated by a salam, then the separated rak'ah alone is the "Witr," and what preceded it is "Shafʿ." "Al-Shafʿ" may also refer to the two rak'ahs that precede the Witr.