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Islamic Sharia disallows a couple remarrying after having been through three divorces.
Some Sunni schools view a triple talaq, when the husband saying "I divorce you" three times in a row, as equivalent to three single talaq. Other Sunnis and Shia treat that as a single divorce, arguing that the Islamic prophet Muhammad did so and Umar having no authority to change that (Muslim 3491, 3492).
Couples cannot remarry until the ex-wife marries another man, to ensure that divorce is not taken lightly. She cannot go back to this husband who has divorced her three times, unless she marries another person who out of his own free will divorces her. This rule is given by the Shari'ah to reduce the occurrence of three divorces and to protect the honor of the woman. Nikah halala cannot be done as a condition or intention to make her lawful to her ex-husband.
Shia use Nikah Mut'ah.
After iddah is observed, the original couple may remarry.
Nikah Halala is used mainly in countries that recognize the triple talaq.
The Qur'an expounds: “And if he has divorced her [for the third time], then she is not lawful to him afterward until [after] she marries a husband other than him. And if the latter husband divorces her [or dies], there is no blame upon the woman and her former husband for returning to each other if they think that they can keep [within] the limits of Allah . These are the limits of Allah , which He makes clear to a people who know”. (2:230, Shahih International Translation).
A man is entitled to take his wife back twice after two respective Talaqs and for a third time also before the expiry of her Iddat after he gives her a Talaq for the third time. But after that the separation is irrevocable. She is then free to be married to any other person of her choice. If then in the normal course of life a dispute between them develops leading to first Talaq by the second husband, she is again free to be married to any person of her choice including the second husband (by whom she has got the first divorce) and also including the first husband as well. The relevant point here is that a Halala cannot be planned in advance, as a Nikah between her and the second husband with an understanding of a divorce afterwards will not be valid. If she does so, it will be an illegitimate relationship with the second husband and with the first husband also with whom she comes to live after a pre-planned Halala. Muhammad(P.BU.H) has cursed both such men who perform Halala and for whom Halala is performed. The second Caliph Hazrat Umar ruled during his reign that he will punish with stoning to death those who perform a pre-planned Halala. Imam Sufian Sauri says: “ If someone marries a woman to make her Halala (for her ex-husband) and then wants to keep her as wife, he is not permitted to do so unless he solemnises a Nikah afresh, as the previous Nikah was unlawful.” (Trimizi) 
Sunni site critical of Nikah Halala