It means a contract that permits a sexual pleasurable relationship between man and wife in the legitimate way.
The Prophet (pbuh) said: ‘Young men, whoever of you can afford marriage should get married. It helps you lower your gaze and maintain your chastity. Those of you who cannot afford it may resort to voluntary fasting, for fasting serves as protection [from sin].’
1. Maintaining one’s chastity.
2. The establishment of a congenial relationship between man and wife.
3. Maintaining proper lineage between parents and offspring.
4. The continuity of the human race.
5. Safeguarding morality, so that people do not sink into adulterous relationships.