Allah Almighty created men and women as company for one another, and so that they can become parents and live in peace and calmness according to the commandments of Allah Almighty. Allah says in Holy Quran:

وَمِنْ ءَايَـٰتِهِۦٓ أَنْ خَلَقَ لَكُم مِّنْ أَنفُسِكُمْ أَزْوَٰجًا لِّتَسْكُنُوٓا۟ إِلَيْهَا وَجَعَلَ بَيْنَكُم مَّوَدَّةً وَرَحْمَةً ۚ إِنَّ فِى ذَٰلِكَ لَـَٔايَـٰتٍ لِّقَوْمٍ يَتَفَكَّرُونَ
“And among His signs is this that He created for you mates from among yourselves, that you may dwell in tranquillity with them, and He has put love and mercy between your hearts. Undoubtedly in these are signs for those who reflect.”(Quran, 30:21).

In Islam, marriage being an obligatory act, is so important that it is declared to be from among the practices of all the prophets (AS). It is narrated by Hadhrat Abu Ayyub (RA) that the Messenger of Allah (ﷺ) said:

أَرْبَعٌ مِنْ سُنَنِ الْمُرْسَلِينَ: الْحَيَاءُ وَيُرْوَى الْخِتَانُ وَالتَّعَطُّرُ وَالسِّوَاكُ وَالنِّكَاحُ
Abu Ayyub (RA) reported Allah’s Messenger ﷺ as saying, “Four characteristics pertain to the practices of the messengers: modesty (but some say circumcision), the use of perfume, the use of the tooth-stick, and marriage.”

Our Holy Prophet Hazrat Muhammad (ﷺ) also married and encouraged others to get married by saying:
جَاءَ ثَلاَثَةُ رَهْطٍ إِلَى بُيُوتِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم يَسْأَلُونَ عَنْ عِبَادَةِ النَّبِيِّ صلى الله عليه وسلم فَلَمَّا أُخْبِرُوا كَأَنَّهُمْ تَقَالُّوهَا فَقَالُوا وَأَيْنَ نَحْنُ مِنَ النَّبِيِّ صلى الله عليه وسلم قَدْ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ وَمَا تَأَخَّرَ‏.‏ قَالَ أَحَدُهُمْ أَمَّا أَنَا فَإِنِّي أُصَلِّي اللَّيْلَ أَبَدًا‏.‏ وَقَالَ آخَرُ أَنَا أَصُومُ الدَّهْرَ وَلاَ أُفْطِرُ‏.‏ وَقَالَ آخَرُ أَنَا أَعْتَزِلُ النِّسَاءَ فَلاَ أَتَزَوَّجُ أَبَدًا‏.‏ فَجَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏ “‏ أَنْتُمُ الَّذِينَ قُلْتُمْ كَذَا وَكَذَا أَمَا وَاللَّهِ إِنِّي لأَخْشَاكُمْ لِلَّهِ وَأَتْقَاكُمْ لَهُ، لَكِنِّي أَصُومُ وَأُفْطِرُ، وَأُصَلِّي وَأَرْقُدُ وَأَتَزَوَّجُ النِّسَاءَ، فَمَنْ رَغِبَ عَنْ سُنَّتِي فَلَيْسَ مِنِّ
A group of three men came to the houses of the wives of the Prophet (ﷺ) asking how the Prophet (ﷺ) worshipped (Allah), and when they were informed about that, they considered their worship insufficient and said, “Where are we from the Prophet (ﷺ) as his past and future sins have been forgiven.” Then one of them said, “I will offer the prayer throughout the night forever.” The other said, “I will fast throughout the year and will not break my fast.” The third said, “I will keep away from the women and will not marry forever.” Allah’s Messenger (ﷺ) came to them and said, “Are you the same people who said so-and-so? By Allah, I am more submissive to Allah and more afraid of Him than you; yet I fast and break my fast, I do sleep and I also marry women. So he who does not follow my tradition in religion, is not from me (not one of my followers). [Bukhari]

By getting married you are obeying the Prophet (ﷺ) and his Sunnah because our beloved Prophet (ﷺ) said:
يَا مَعْشَرَ الشَّبَابِ مَنِ اسْتَطَاعَ مِنْكُمُ الْبَاءَةَ فَلْيَتَزَوَّجْ
“O young people! Whoever among you is able to marry, should marry.” (Al Bukhari)

Marriage guarantees physical and spiritual chastity and peace of a person and keeps the couple away from the downfall and trap of Shaytaan.

Through marriage, the couples achieve mutual affection, mercy, and love. Allah says:

“And He has put between you affection and mercy” (Quran, 30:21)

With marriage, the couple will have righteous offspring. It is the survival of generation and it results in obtaining great rewards by having righteous children.

By marrying and fulfilling the rights of the husband, the believing woman will enter into Paradise.
A righteous wife is the better provision of this world. The Prophet (ﷺ) said:
“This world is but provision, and there is no provision in this world better than a righteous wife.”(Muslim)

Marriage increases sustenance, love, respect, caring, selflessness and forgiving factors between husband and wife.