The Nafl prayer is a voluntary prayer that can be performed at any time, except during the prohibited times for prayer. It can be prayed in units of two rak'ahs, and there is no specific number of rak'ahs that need to be performed. The prayer begins with the intention to pray the Nafl prayer, followed by the Takbir (saying "Allahu Akbar") to start the prayer. Then, the individual performs the usual actions of the prayer, including reciting Surah Al-Fatiha and a portion of the Quran, and performing the ruku' (bowing) and sujood (prostration). After completing the prayer, the individual can make a du'a (supplication) if they wish. **

The Nafl prayers can be performed at any time except during the prohibited times (sunrise, sunset, and when the sun is at its zenith). There is no specific order for Nafl prayers, as they are voluntary prayers that can be offered individually or in sets of two units (rak'ahs). Some common Nafl prayers include the Tahajjud (night prayer), Ishraq (morning prayer), Duha (forenoon prayer), and Salatul Tasbeeh. It is recommended to offer Nafl prayers with sincerity and devotion to earn extra rewards and draw closer to Allah. **

The order of the Nafl prayer is similar to the order of the obligatory (Fard) prayer. It consists of making the intention, followed by the Takbir (saying "Allahu Akbar" to start the prayer), then reciting Surah Al-Fatiha and another portion of the Quran, followed by Ruku (bowing), Sujood (prostration), and finally the Tashahhud and Salam to conclude the prayer. However, the number of units (Rakats) and specific prayers may vary depending on the type of Nafl prayer being performed. **

Witr, Tahajjud, and Nafl are all types of voluntary prayers in Islam. Witr is a specific prayer that is performed after the Isha prayer and is usually an odd number of rakats. Tahajjud is a night prayer that is performed after sleeping and then waking up in the later part of the night. Nafl prayers, on the other hand, are any additional prayers that a person can perform at any time of the day or night, apart from the obligatory prayers. Each of these prayers has its own significance and benefits in Islam. **

Fard refers to obligatory acts in Islam that must be performed, such as the five daily prayers. Nafl are voluntary acts of worship that are not obligatory but are encouraged, such as extra prayers or fasting. Sunnah are the practices of the Prophet Muhammad that are highly recommended for Muslims to follow, but not performing them does not incur sin. **

After the Witr prayer, it is recommended to perform two units of nafl prayer. These two units are known as the Shaf' prayer. It is a Sunnah mu'akkadah (emphasized Sunnah) and is highly encouraged to perform. Additionally, there is no specific limit to the number of nafl prayers that can be performed after the Witr prayer, so one can continue to pray nafl as much as they desire. **

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There are 12 Sunnah prayers in total, which are additional prayers that Prophet Muhammad used to perform regularly. Nafl prayers, on the other hand, are voluntary prayers that a person can perform at any time, apart from the obligatory prayers. Nafl prayers are considered to be a way to earn extra rewards and draw closer to Allah. **