What exactly is Tasawwuf?

English Bayan No. 250

Hazrat Syed Shabbir Ahmad Kakakhel حفظه الله
Khanqah Rehmkaria Imdadia - H# CB 1991/1 Near Masjid Ameer Hamza RA, Street 4, Allah Abad, Westridge 3, Rawalpindi
What exactly is Tasawwuf? - English Bayaan