Explanation of The Book of Divorce By Shaykh Muhammad bin Salih al-Uthaymin Book 1

Divorce refers to the termination of marriage revocable or irrevocably." By this, [I mean] that divorce can be an irreversible separation (Baynana Kubra) or a reversible separation (Baynfina Sughra). In the case of irreversible separation, a woman is completely separated from her husband and may not return to him unless after marrying another man. The reversible separation includes divorce cases where a woman is divorced one or two times (not three times as in irreversible separation) and may therefore return to her husband who is permitted to end the separation and take her as his wife once more.