Tariqa

A tariqa (or "tariqah"; "") is a school or order of Sufism, or specifically a concept for the mystical teaching and spiritual practices of such an order with the aim of seeking "haqiqa", which translates as "ultimate truth".
A tariqa has a "murshid" (guide) who plays the role of leader or spiritual director. The members or followers of a tariqa are known as "muridin" (singular "murid"), meaning "desirous", viz. "desiring the knowledge of God and loving God" (also called a "faqir").
Tariqa is also believed to be the same as Tzadik of Judaism meaning the "rightly guided one". 
The metaphor of "way, path" is to be understood in connection of the term "sharia" which also has the meaning of "path", more specifically "well-trodden path; path to the waterhole". The "path" metaphor of "tariqa" is that of a further path, taken by the mystic, which continues from the "well-trodden path" or exoteric of "sharia" towards the esoteric "haqiqa". A fourth "station" following the succession of "shariah", "tariqa" and "haqiqa" is called "marifa". This is the "unseen center" of "haqiqa", and the ultimate aim of the mystic, corresponding to the unio mystica in Western mysticism. "Tasawwuf", an Arabic word that refers to mysticism and Islamic esotericism, is known in the West as Sufism.
Orders of Sufism.
The most popular tariqa in the West is the Mevlevi Order, named after Jalal ad-Din Muhammad Rumi. In the same time the Bektashi Order was also founded, named after the Alevi Muslim saint Haji Bektash Veli. Four large tariqas in South Asia are: the Naqshbandi Order, named after Baha-ud-Din Naqshband Bukhari; the Qadiri Order, named after Abdul Qadir Jilani; the Chishti Order, named after Khawaja Mawdood Chisti while Khawaja Moinuddin Chishti is the most famous sheikh; the Suhrawardi Order, named after Shahab al-Din Suhrawardi. Large tariqats in Africa include Muridiyya and Tijaniyya. Others can be offshoots of a tariqa. For example, the Qalandariyya has roots in Malamatiyya (with Buddhism and Hinduism influence) and Wafa'i (a combination of Yasawiyya-Sunni and Batiniyya-Shia) of orders are offshoots of the Suhrawardi order. The Ashrafia after the 13 the century illustrious sufi saint Ashraf Jahangir Semnani is the sub branch of Chishti spiritual lineage. The Maizbhandari Tariqa or Maizbhandari Sufi Order is a liberated Sufism order established in the Bangladesh in the 19th century by the Gausul Azam Shah Sufi Syed Ahmadullah Maizbhandari (1826 AD − 1906 AD), 27th descendant of the Islamic prophet, Muhammad.
Membership of a particular Sufi order is not exclusive and cannot be likened to the ideological commitment to a political party. Unlike the Christian monastic orders which are demarcated by firm lines of authority and sacrament, Sufis often are members of various Sufi orders. The non-exclusiveness of Sufi orders has consequences for the social extension of Sufism. They cannot be regarded as indulging in a zero sum competition which a purely political analysis might have suggested. Rather their joint effect is to impart to Sufism a cumulant body of tradition, rather than individual and isolated experiences.
In most cases the sheikh nominates his "khalifa" or "successor" during his lifetime, who will take over the order. In rare cases, if the sheikh dies without naming a "khalifa", the students of the tariqa elect another spiritual leader by vote. In some orders it is recommended to take a "Khalif" from the same order as the "murshid". In some groups it is customary for the khalifa to be the son of the sheikh, although in other groups the khalīfa and the sheikh are not normally relatives. In yet other orders a successor may be identified through the spiritual dreams of its members.
Tariqas have "silsilas" () "chain, lineage of sheikhs". Almost all orders except the Naqshbandi order claim a "silsila" that leads back to Muhammad through Ali. (The Naqshbandi Silsila goes back to Abu Bakr, the first Caliph of Sunni Islam, and then Muhammad ibn Abi Bakr. Historians however have traced this chain back to Ali as Muhammad ibn Abi Bakr was brought up by Ali from the age of three).
Note: There are other Sufi Orders that have other Sahabis R.A. in their chain of transmission of Bayt, i.e. Owaisayah order traces its chain through Caliph Umar Farooq, Uthmaniyah Haqqaniyah traces its chain through Caliph Uthman bin Affan, Seeriniyah traces its chain of bayt through Mohammed bin Sirin through Anas bin Malik to the Prophet. 
Every "Murid", on entering the tariqa, gets his "awrad", or daily recitations, authorized by his "murshid" (usually to be recited before or after the pre-dawn prayer, after the afternoon prayer and after the evening prayer). Usually these recitations are extensive and time-consuming (for example the "awrad" may consist of reciting a certain formula 99, 500 or even 1000 times). One must also be in a state of ritual purity (as one is for the obligatory prayers to perform them while facing Mecca). The recitations change as a student (murid) moves from a mere initiate to other Sufi degrees (usually requiring additional initiations). The Initiation ceremony is routine and consists of reading chapter 1 of the Quran followed by a single phrase prayer. Criteria have to be met to be promoted in rank: the common way is to repeat a single phrase prayer 82,000 times or more as in the case of Burhaniyya, a number that grows with each achieved rank. Murids who experience unusual interaction during meditation: hear voices like "would you like to see a prophet?" or see visions who might even communicate with the Murid are held dear in the "Haḍra", the weekly group-chanting of prayers in attempt of reaching spirits as they are likely to experience something unusual and pass it on. This Murid is promoted faster than others. The least common way is to cause a miracle to happen with criteria similar to that of Catholic Sainthood.
Being mostly followers of the spiritual traditions of Islam loosely referred to as Sufism, these groups were sometimes distinct from the "Ulma" or officially mandated scholars, and often acted as informal missionaries of Islam. They provided accepted avenues for emotional expressions of faith, and the Tariqas spread to all corners of the Muslim world, and often exercised a degree of political influence inordinate to their size (take for example the influence that the sheikhs of the Safavid had over the armies of Tamerlane, or the missionary work of Ali-Shir Nava'i in Turkistan among the Mongol and Tatar people).
History.
The tariqas were particularly influential in the spread of Islam in the sub-Sahara during the 9th to 14th centuries, where they spread south along trade routes between North Africa and the sub-Saharan kingdoms of Ghana and Mali. On the West African coast they set up Zawiyas on the shores of the river Niger and even established independent kingdoms such as "al-Murabitun" or Almoravids. The Al Hakika Mizaan Mizaani Sufi Order deals with heavy internalization and meditations, their spiritual practice is called Al Qudra Mizaan [(United States)]. The Sanusi order were also highly involved in missionary work in Africa during the 19th century, spreading both Islam and a high level of literacy into Africa as far south as Lake Chad and beyond by setting up a network of "zawiyas" where Islam was taught.
Much of Central Asia and southern Russia was won over to Islam through the missionary work of the Tarīqahs, and the majority of Indonesia's population, where a Muslim army never set foot, was converted to Islam by the perseverance of both Muslim traders and Sufi missionaries. Sufism in India played a similarly crucial role in the diffusion of Islam at the élite and popular levels; its music, art, and poetry flourished in a highly sophisticated Persianate society.
Tariqas were brought to China in the 17th century by Ma Laichi and other Chinese Sufis who had studied in Mecca and Yemen, and had also been influenced by spiritual descendants of the Kashgarian Sufi master Afaq Khoja. On the Chinese soil the institutions became known as "menhuan", and are typically headquartered near the tombs ("gongbei") of their founders.
Certain scholars, e.g., G. H. Jansen, credit the original tariqas with several specific accomplishments: