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As Salaam Walaykum,

Specifically, Durood Shareef is sending blessings unto Rasooli Akram SAW.

Almighty Allah says: "Surely Allah and His Angels send blessings on the Holy Prophet (Sall Allahu ‘alaihi wa Salim). O you who believe! Send Blessings (Durood) and Salutations (Salaams) on the Prophet with worthy Salutation". (Surah al-Ahzab: 56)

In this verse of the Holy Quran, Almighty Allah, His Malaa'ikah and the Muslims have been mentioned as sending Durood upon Sayyiduna Rasoolullah (Sall Allahu ‘alaihi wa Salim). So, Durood Shareef is actually "a Du'a in praise of the Holy Prophet Muhammad (Sall Allahu ‘alaihi wa Salim)."

Hazrat Anas (radi Allahu anhu) narrates that Sayyiduna Rasoolullah (Sall Allahu ‘alaihi wa Salim) said: "He who reads a single Durood upon me, Almighty Allah blesses him ten times, ten of his sins are forgiven, and he is increased ten times in stages (internally). (Mishkaat)

The Holy Prophet (Sall Allahu ‘alaihi wa Salim) said that he himself recites blessings on one who recites Durood on him.

So Any Salawat upon Rasoolullah SAW is darood Shareef.

For more information regarding the high merits associated with reciting Darood Shareef Read the Book "Aab e Kawthar"

or this website http://www.ummah.net/Al_adaab/salawaat_o_salaam.html

and for a list of different darood Shareef, along with the Arabic and English Translitteration and Translation go to http://www.islamicacademy.org/html/D...d_Taaj_Eng.htm