Al-Mulk الملك, "Sovereignty, Kingdom") is the 67th chapter of the Quran, comprising 30 verses

The surah emphasizes that no individual can impose his will on another; he may only guide and set an example (67:26)

1-3 Praise to the Almighty, the Creator and Ruler of all things
3-5 The perfection of the works of God, seen in the heavens, glorify him
5 We have adorned the lowest heaven with lamps and have made them missiles with which to pelt the devils; and We have prepared for them the punishment of the raging fire
6-8 Torments of hell prepared for unbelievers
8-11 Infidels shall confess in hell their folly in calling Muhammad an impostor
12 Verily those who fear their Lord unseen will have forgiveness and a great reward.
13-14 God knoweth all things
15-18 God shall destroy unbelievers
19-24 Unbelievers ungrateful to the God who sustains them in life
25-28 They challenged the Prophet to hasten the judgment-day, but they shall dread its approach
29-30 The Merciful the only protector on that day[4]

Al-Mulk, 23-24

“He is the One Who brought you into being and gave you hearing, sight, and intellect. ˹Yet˺ you hardly give any thanks.” (67:23)

Allah it is Who multiplied you in the earth and to Him you will be mustered (67:24)

Imam Ahmad recorded from Abu Hurayrah that Muhammad said,"Verily, there is a chapter in the Quran which contains thirty Ayat that will intercede on behalf of its reciter until he is forgiven. (It is): 'Blessed be He in Whose Hand is the dominion. ( Al-Mulk 67)'"[12][13][14]
Muhammad said, 'There is a surah in the Quran which is only thirty verses. It defends whoever recites it until it puts him into Jannah'[15]
Anas ibn Malik reported Muhammad as saying, "There is a Surah which will plead for its reciter till it causes him to enter paradise."[16]
Muhammad said, 'Surah al Mulk is the protector from the torment of the grave'[17]
Jabir said it was the custom of not to go to sleep until he had read Tabarakalladhi Biyadihil Mulk(Al-Mulk) and Alif Laam Meem Tanzeel (As-Sajda).[18]
He used to recite Surah As-Sajdah and Surah Al-Mulk (in Arabic) before sleeping.[19]

Khalid bin Madam said about surat Al Mulk and As-Sajda that these two surahs will fight for their reciter in the grave and will say, 'O Allah! If we belong to Your book, accept our intercession in his favour. In case we do not, get us obliterated. These surahs will spread their wings like birds and will save the person from the torment of the grave.'[22]
It was narrated that Abd Allah ibn Mas'ud said: Whoever reads Tabarakalladhi Biyadihil Mulk [i.e. Surah al-Mulk] every night, Allah will protect him from the torment of the grave. At the time of the Messenger of Allah, we used to call it al-mani'ah (that which protects). In the Book of Allah it is a surah which, whoever recites it every night has done very well.[23][24]
Abdullah ibn Masud is reported to have said, 'A man will be approached in his grave from his legs and from his chest and then from his head. And each time this Surah will defend him by saying, 'You cannot do anything to him, he used to recite Surah Mulk'.'
Abdullah ibn Masud further states, 'It is called, 'Al-maani'ah'. For it protects from the punishment of the grave.'[25]
Ibn Umar said that once that Muhammad recited verse 2 (the One Who created death and life so that He may test you as to which of you is better in deeds) and when he reached the words "better in deeds", he stopped and explained that 'better in deeds' is the person who abstains most from the things Allah has forbidden and is always ready to obey Him."
There is a surah (chapter) in the Quran which consists of thirty verses which will keep interceding about a man until he is forgiven. The Surah is Tabarak Allazi Biyadihi al-Mulk i.e. ‘Blessed is He in Whose Hand is the Kingdome’.

Surah Mulk has multiple benefits and Virtues, even it is one of the most beneficial chapters of Qur'an spiritually and theoritically

Al-Mulk الملك "Sovereignty, Kingdom"