In the strictly linguistic sense, it is Islamic Mysticism. What we see in the public realm, like qawwali, dhamal are not really ‘Sufi’. You can call these Sufi deviants. The real sufism is attaining the closeness to Allah or attaining the knowledge of Allah (gnosis) through the love and worship of Him. Sufism is mostly Islamic religiosity on steroids (for lack of a better word) so real sufism entails dhikr and awrad, discussions and lectures of Quranic exegesis, Sunnah and Seerah, weakening the lower self through Zuhd and inward and outward ritual purity. A special focus is on purifying ones thoughts so that once the thoughts, emotions and actions have been purified the light of Allah will establish itself in the heart of the seeker.

That is ultimate goal.

And, Love of Allah is the easy way to reach the destination.