What is Sufism?

Answer 1
Surfism is an Islamic concept which the followers are seeking for divine truth and love though a direct encounter with the God. This arose in the mid-18th and 19th century C.E.

Answer 2
Sufism is branch of Islam that is more concerned with an emotional connection to God than an emphasis on legal doctrines. Sufis do not emphasize Islamic law and are much more interested in loving God and devoting themselves to seeing higher-meanings in sacred texts. They also seek to replicate the relationships that other now-dead Sufi Scholars had with the Divine, which is why they pray near the physicality of the dead Saint (i.e. at his tomb). Sufism advances the beliefs of Islam in a looser and more emotional way than traditional Islam.